CobaltApps

With this Plugin you can easily overlay all of your iFrame video embeds with either a default image 
provided by the Plugin or your own custom image. This is ideal for branding your videos, making them 
load faster, look cleaner and respond to the width of the browser/device.
An alternate feature of this Plugin is to simply make your iFrame video embeds fully responsive 
so that they perfectly fit any smaller browser window or device.
Either feature will wrap your iFrame video embeds in unique HTML divs which allow you to easily style 
your videos independently or as a whole.
See more of my work over at <a href="http://catalysttheme.com" rel="nofollow ugc">CatalystTheme.com</a>.

Video Overlayer

Video Overlayer is a Plugin that overlays your embedded iFrame videos with an image. Make your embedded videos responsive, branded, cleaner, faster.

SaltTechno

The easiest & lightest WordPress plugin for fluid width video embeds. No extra settings required. Just install the plugin and enjoy responsive video embeds on your blog.
This plugin supports videos embedded from:
<ul>
<li>YouTube</li>
<li>Vimeo</li>
<li>Videopress</li>
<li>Vine</li>
<li>Blip.tv</li>
<li>Viddler</li>
<li>Kickstarter</li>
</ul>

Install FitVids – Embed fluid width Videos

The easiest & lightest WordPress plugin for fluid width video embeds. No extra settings required. Just install the plugin and enjoy responsive vid …

Video Overlayer vs Install FitVids – Embed fluid width Videos