So one neat thing about Twitch is that it has channel extensions which are basically interactive overlays. So, for example, with some card games viewers can mo

So one neat thing about Twitch is that it has channel extensions which are basically interactive overlays. So, for example, with some card games viewers can mouse over a card in the stream video and get tooltips/card text/information. It only works for some live content and not vods though. I imagine storing all the required information for vods would be challenging.