This is a plugin meant for (https://github.com/mojombo/jekyll)[Jekyll].
Example use:
Easily embed a YouTube video. Just drop this file in your _plugins directory.
{% youtube oHg5SJYRHA0 %}
You can also specify a height and width. If you do not, it defaults to 560 x 420.
{% youtube oHg5SJYRHA0 500 400 %}