jeroenooms

This WordPress plugin makes embedded media responsive.
To embed a video or another object into a WordPress post or page, place its URL into the content area. 
Make sure the URL is on its own line and not hyperlinked (clickable when viewing the post).
WordPress will automatically turn the URL into a YouTube embed and provide a live preview in the visual editor. 
Read more information about supported platforms and alternative implementations at <a href="https://codex.wordpress.org/Embeds" rel="nofollow ugc">WordPress.org</a>.
<h4>Supported platforms with this Responsive Media plugin</h4>
After installing this plugin, the following media will be responsive automaticly even on earlier published posts and pages. The version numbers show since when these oEmbedded media are supported by WordPress.
<ul>
<li>Flickr (2.9.0) [1]</li>
<li>Kickstarter (4.2.0)</li>
<li>Slideshare (3.5.0)</li>
<li>Soundcloud (3.5.0)</li>
<li>Speakerdeck (4.4.0)</li>
<li>TED Talks (4.0.0)</li>
<li>Videopress (4.4.0)</li>
<li>Vimeo (2.9.0)</li>
<li>Vine (4.1.0)</li>
<li>Youtube (2.9.0) [2]</li>
<li>WordPress.tv (2.9.0)</li>
</ul>
Responsive support without plugin:
<ul>
<li>Meetup (3.9.0)</li>
</ul>
[1] Flic.kr domain since 3.6.0 
[2] Youtu.be domain since 3.0.0, Youtube playlists since 4.0.0

Responsive Media

Wordpress plugin for responsive embedded media (oEmbed) like Youtube, Vimeo, Flickr, Kickstarter, Slideshare, Soundcloud, Speakerdeck, TED & Vine.

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

Responsive Media vs Responsive videos – Fitvids