There is a Windows 10 video feature baked into the new game DVR.
, and a small bar pops up, with a video-capture button. The first time you do this in a particular program, Windows will ask you to confirm that the program is a game, before starting Game DVR.
, and it will automatically start capturing video from the program you’ve got open, rather than the entire screen. It’s a feature aimed at gamers who want to share in-game clips, but it works equally well for sending a how-to video tutorial on using Google.
more details there.
To show you what could be done with it, i have created a video from my ObjReader64 playing an OpenGL 3D high polygon object in full screen mode.