this plugin is a terrific idea, so well done for working on it.
I can see the plugin clearly working when adding this to the post:
However if I add the embed code from youtube:
<iframe width="420" height="315" src="//www.youtube.com/embed/dQw4w9WgXcQ" frameborder="0" allowfullscreen></iframe>
Then it does not work. Sometimes we need to add this code because we want to play with video settings (captions on/off, etc.).
Is there a way the plugin works with the iframe, or is this completely out of scope?