I implemented this feature in my project...following along with this video was flawless.  However, my embeded youtube video in ActionText has a src of the actual youtube url, which I need to avoid.  I don't want a savy user to be able to access the video link in the page source.   I see your source is a blob, so I'm assuming maybe you are hosting these videos and are not using youtube.  Is that correct?   I wonder how I could accomplish that without hosting my own videos?