I've seen a few places that do this. edx was doing it for some courses at one point. Here's a demo from 3play: http://www.3playmedia.com/services-features/plugi

I've seen a few places that do this. edx was doing it for some courses at one point. Here's a demo from 3play: http://www.3playmedia.com/services-features/plugins/interactive-transcript/ http://www.3playmedia.com/services-features/plugins/interact...