It uses the FitVids.js library for fluid width video embeds (e.g. flash video in
<iframe>s). You don't need it for pure HTML5 videos.
It supports YouTube, Vimeo, Blip.tv and Kickstarter by default, and can use it with other video providers like Facebook or Viddler.
It's useful if you are using a responsive theme (such as AdaptiveTheme, Omega or Zen), and want the videos to scale.
You can usually use the defaults. It assumes that you'll want to apply it to all videos in a div with
class="region". If your theme uses a different class or id, or you only want to target certain videos, you can specify that class/id in the video containers field. You can use any valid jQuery selector, e.g.,
You can specify as many containers as you want.
Not all players will work with FitVids, but you can try it out by adding the domain (in the Custom iframe URLs field).