This plugins wraps oEmbed generated HTML with divs that allow for styling them with CSS (style sheet of the theme).

WP Company

Media Focus Point

The Media Focus Point Plugin ensures the key area of an image or video stays visible, regardless of resizing or layout changes.

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Vertical Center

Easily vertically center any element relative to its container. Fully responsive.

honza.skypala

Support for oEmbed, which was added to WordPress in version 2.9, is very nice. Unfortunately the generated oEmbed code is not easy to be centered in the text, which is a common request. This plug-in allows for centering (or even other styling), although it will not solve it by itself, just makes it possible.
This plugin wraps all oEmbed code into div tags with several classes set:
<ul>
<li>oembed</li>
<li>oembed-mediatype (e.g. oembed-video)</li>
<li>oembed-server (e.g. oembed-youtube-com)</li>
<li>oembed-mediatype-server (e.g. oembed-video-youtube-com)</li>
</ul>
Then you can specify in your theme CSS (in the file style.css) the way you want the embeds to behave. E.g. by adding the following code to style.css:
<pre>
.oembed {
 text-align: center;
}
</pre>
you will make all oembeds (videos and pictures) to be centered; anyway, if you understand CSS, you are not limited by centering, but you can add much more (like frames around pictures etc.)
<h3>License</h3>
WTFPL License 2.0 applies
<pre><code> DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 Version 2, December 2004

Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>

Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.

 DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

 0. You just DO WHAT THE FUCK YOU WANT TO.
</code></pre>

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