Kodetop

WP Youtube Player allow insert Youtube videos on WordPress using a single quicktag <code>[tube][/tube]</code>
Features
<ul>
<li>Easy install</li>
<li>Embed Youtube movies with simple code</li>
<li>Panel for easy configuration</li>
<li>Config Player version (AS2 & AS3)</li>
<li>Support config themes for player</li>
<li>Support HTML5 Player</li>
<li>Support tubePlayer (http://blog.unijimpe.net/tubeplayer/) for play videos.</li>
<li>Generate <code><object></code> code for Feed compatibility </li>
<li>Generate <code><object></code> code optimized for iPhone</li>
</ul>
For insert single youtube video on Post Content or Text Widget you can use ‘Youtube URL’, ‘Youtube Embed URL’ or ‘Youtube Video ID’:
<pre><code>[tube]http://www.youtube.com/watch?v=AFVlJAi3Cso[/tube]

[tube]http://www.youtube.com/v/AFVlJAi3Cso[/tube]

[tube]AFVlJAi3Cso[/tube]
</code></pre>
To insert video with specific size can user width and height:
<pre><code>[tube]http://www.youtube.com/watch?v=AFVlJAi3Cso, 500, 290[/tube]
</code></pre>
To insert video on template, use the php code:
<pre><code><?php wp_youtubeplayer("movie.swf", "width", "heigth"); ?>
</code></pre>
For more information visit <a href="http://blog.unijimpe.net/wp-youtube-player/" title="plugin website" rel="nofollow ugc">plugin website</a>

WP YouTube Player

Sibin Grasic

Responsive Videos plugin will allow you to automatically resize and scale your embedded videos on mobile devices. 
CSS selector option is provided so you can target only your post / page content container.
Features
<ul>
<li>Automatic configuration option</li>
<li>Automatically resizes / scales all your embedded videos</li>
<li>Works on all browsers</li>
<li>Highly compatible – you can change the css selector for the text highlight</li>
<li>Customizable – you can select the page type on which to activate the fitVids script</li>
</ul>

Responsive videos – Fitvids

Nice one

Good

Make your Embedded videos responsive on mobile devices with jQuery FitVids plugin

WP YouTube Player vs Responsive videos – Fitvids