ayoubmedia

<p>Insert YouTube™ videos directly in your post in one of the following ways:</p>
<ol>
<li>Embed video.</li>
<li>shortCode for embed video.</li>
<li>YouTube image with popup video using thickbox.</li>
<li>YouTube image with a link to the video on YouTube website.</li>
<li>YouTube original title with a link to the video on YouTube website. </li>
</ol>
<p>You can insert the original title and description in your post.<br />
You can resize the embed video or image.</p>
<p>“AM – YouTube it” works out of the box. Just install it, activate it and use it.</p>


AM YouTube it

Eirudo

<p>Embed YouTube videos and keept their aspect ratio, just using simple shortcode.</p>
<ul>
<li>Simple shortcode, can be used in the posts or widgets.</li>
<li>Using default YouTube Embed Code (iframe), but make it responsive</li>
<li>Custom aspect ratio, if you want set different porpotion size.</li>
<li>Auto centered position. So if you insert it on your post section, the video always on center-aligned.</li>
<li>Lazy Load supported.</li>
<li>100% Free! And no ads or even trackers inside.</li>
</ul>
<h3>Arbitrary section</h3>
<h3>A brief Markdown Example</h3>
<p>Pros:<br />
1. Simple, only using shortcode to use for individual video each shortcode<br />
2. Lazy Load supported<br />
3. Custom parameters for advanced use</p>
<p>Cons:<br />
1. Only for simple use,not for advanced playlist. Embedding one video for each shortcode.</p>


Simple YouTube Responsive

Perfect

You can add a line to your functions.php to make videos responsive if you're doing your own theme. However, if you're not, this plugin works beautifully and gives other options like lazy load, etc. 

If doing your own theme, add: add_theme_support( 'responsive-embeds' );

Works Beautifully

Embed responsive YouTube videos using simple shortcode. Lazy Load supported.

AM YouTube it vs Simple YouTube Responsive