Jordain Kahn, writing for 9 to 5 Mac:
With ReplayKit, developers will be able to offer users the ability to screen record gameplay or other apps automatically or manually with a single tap. Users will then be able to share recorded content through an iOS share sheet directly to social networks and video sharing sites. Apple pauses all incoming notifications and anything that might ruin the gameplay video experience, and only users will have access to the recorded videos.
I’ve considered recording gameplay videos of Hearthstone in the past, but decided against it because I only play on my iPad. I would have had to connect my iPad to my Mac and record the video in QuickTime, which is exactly why I abandoned the idea. I wanted a no fuss solution to screen recording in iOS 9 and Apple’s delivering just that.