Steven Vachon

This plugin allows you to create internal <code><a></code> links within your content that will not break when things get renamed or moved. While there are similar plugins available, they do not offer important SEO options.
You can add any HTML attribute to your link as long as it’s prefixed with “attr_”. And because it supports attributes that may not currently exist, it is future proof.
Examples:
<ol>
<li>Link to a post/page by ID or slug
<ul>
<li>Shortcode: <code>[link id="1234"/]</code></li>
<li>Shortcode: <code>[link slug="post-slug"/]</code></li>
<li>Output: <code><a href="http://domain.com/post-slug/">Post Title</a></code></li>
</ul>
</li>
<li>Link to a category by slug
<ul>
<li>Shortcode: <code>[link cat="cat-slug"/]</code></li>
<li>Output: <code><a href="http://domain.com/cat-slug/">Category Name</a></code></li>
</ul>
</li>
<li>Link to a tag by slug
<ul>
<li>Shortcode: <code>[link tag="tag-slug"/]</code></li>
<li>Output: <code><a href="http://domain.com/tag-slug/">Tag Name</a></code></li>
</ul>
</li>
<li>Custom text instead of retrieved title
<ul>
<li>Shortcode: <code>[link id="1234"]custom text[/link]</code></li>
<li>Output: <code><a href="http://domain.com/post-slug/">custom text</a></code></li>
</ul>
</li>
<li>Additional attributes for SEO/other
<ul>
<li>Shortcode: <code>[link id="1234" attr_rel="something" attr_itemprop="specialty"/]</code></li>
<li>Output: <code><a href="http://domain.com/post-slug/" rel="something" itemprop="specialty">Post Title</a></code></li>
</ul>
</li>
</ol>

SEO Internal Link Shortcode

Internal links to posts, custom-type posts, pages, categories and tags with any HTML attribute(s).

pupunzi

A Chrome-less Youtube® video player that let you play any YouTube® video as background of your WordPress® page or post. 
You can activate it for your home page from the settings panel (no license needed) or on any post or page using the short code (need the <a href="https://pupunzi.com/wpPlus/go-plus.php?plugin_prefix=YTPL" rel="nofollow ugc">Plus version</a>) as described in the Reference section of the settings.
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/lTW937ld02Y?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
If you prefer to use a Vimeo video you can take a look at <a href="https://wordpress.org/plugins/wp-vimeoplayer/" rel="ugc">mb.VimeoPlayer WordPress plug-in</a>
note: 
If you don’t want ADs on your background video and you are the owner of it you can disable this on your Youtube channel as explained here: http://candidio.com/blog/how-to-remove-ads-from-your-youtube-videos .
<ul>
<li>demo: <a href="http://pupunzi.com/mb.components/mb.YTPlayer/demo/demo.html" rel="nofollow ugc">See the Youtube background video in action!</a></li>
<li>video: <a href="http://www.youtube.com/watch?v=lTW937ld02Y" rel="nofollow ugc">See a short video tutorial</a></li>
<li>pupunzi blog: <a href="http://pupunzi.open-lab.com" rel="nofollow ugc">Go to my blog</a></li>
<li>pupunzi site: <a href="http://pupunzi.com" rel="nofollow ugc">Go to my site</a></li>
</ul>
This plug in has been tested successfully on:
<ul>
<li>Chrome 11+, Firefox 7+, Opera 9+ on Mac OsX, Windows and Linux</li>
<li>Safari 5+ on Mac OsX</li>
<li>IE7+ on Windows (via Adobe Flash player)</li>
</ul>
<h3>To set your homepage background video:</h3>
<ol>
<li>Go to the mbYTPlayer settings panel (you can find it under the “settings” section of the WP backend.</li>
<li>set the complete YT video url</li>
<li>set all the other parameters as you need.</li>
</ol>
You can also set it by placing a shortcode in the home page via the YTPlayer shortcode window (<a href="https://pupunzi.com/wpPlus/go-plus.php?plugin_prefix=YTPL" rel="nofollow ugc">Plus version</a>). 
You can open it by clicking on the YTPlayer button in the top toolbar of the page editor.
<h3>To set a video as background of a post or a page:</h3>
Use the editor button or write the below shortcode into the content of your post or page (<a href="https://pupunzi.com/wpPlus/go-plus.php?plugin_prefix=YTPL" rel="nofollow ugc">Plus version</a>):
[mbYTPlayer url=”http://www.youtube.com/watch?v=V2rifmjZuKQ” ratio=”4/3″ mute=”false” loop=”true” showcontrols=”true” opacity=1]
<ul>
<li>@ url = the YT url of the video you want as background</li>
<li>@ ratio = the aspect ratio of the video 4/3 or 16/9</li>
<li>@ mute = a boolean to mute the video</li>
<li>@ loop = a boolean to loop the video on its end</li>
<li>@ showcontrols = a boolean to show or hide controls and progression of the video</li>
<li>@ opacity = a value from 0 to 1 that set the opacity of the background video</li>
<li>@ id = The ID of the element in the DOM where you want to target the player (default is the BODY)</li>
<li>@ quality:
<ul>
<li>small: Player height is 240px, and player dimensions are at least 320px by 240px for 4:3 aspect ratio.</li>
<li>medium: Player height is 360px, and player dimensions are 640px by 360px (for 16:9 aspect ratio) or 480px by 360px (for 4:3 aspect ratio).</li>
<li>large: Player height is 480px, and player dimensions are 853px by 480px (for 16:9 aspect ratio) or 640px by 480px (for 4:3 aspect ratio).</li>
<li>hd720: Player height is 720px, and player dimensions are 1280px by 720px (for 16:9 aspect ratio) or 960px by 720px (for 4:3 aspect ratio).</li>
<li>hd1080: Player height is 1080px, and player dimensions are 1920px by 1080px (for 16:9 aspect ratio) or 1440px by 1080px (for 4:3 aspect ratio).</li>
<li>highres: Player height is greater than 1080px, which means that the player’s aspect ratio is greater than 1920px by 1080px.</li>
<li>default: YouTube selects the appropriate playback quality.</li>
</ul>
</li>
</ul>
<h3>mb.YTPlayer Plus</h3>
With the <a href="https://pupunzi.com/wpPlus/go-plus.php?plugin_prefix=YTPL" rel="nofollow ugc">Plus version</a> you’ll get:
<ul>
<li>Remove the water-mark from the video</li>
<li>Set the video opacity</li>
<li>Set the video quality</li>
<li>Set the video aspect ratio</li>
<li>Set the video start point</li>
<li>Set the video end point</li>
<li>Show the control bar</li>
<li>Choose the full screen behavior</li>
<li>Set the starting audio volume</li>
<li>Choose if the video should start mute or not</li>
<li>Choose if the video should loop</li>
<li>Add a raster image over the video</li>
<li>Track the video views on Google Analytics</li>
<li>Choose if the player should pause if the windows blur</li>
<li>Add any YTPlayer video as background of any page or as backgraund of any element of your page enabling the short-code editor.</li>
<li>Use the YTPlayer to display a clean Youtube video as player (via short-code).</li>
</ul>
<h3>What about mobile</h3>
The mb.YTPlayer now works on mobile devices! 
The video starts as soon the device screen is touched.

mb.YTPlayer for background videos

Play any Youtube video as background of your page or as custom player inside an element of the page.

SEO Internal Link Shortcode vs mb.YTPlayer for background videos