You can screen record facetime on apple phones. Its pretty close to what the op is asking i think. It does not slow the phone to a crawl. I don't use android myself for about 5 years now but id be surprised if apple had one over on android like that. Imagine the fanboys and fangirls crowing from the apple side if that was the case lol. A quick search confirms you can also screen record in android OS as an inbuilt OS function. Sounds like a cool idea to do in game recording and playback of boss take downs any way. Interesting to see what other make of the idea.