oh wow I hadn't seen that before, if you find out it captures rectangle, let me know
I haven't had a chance to test it yet, but I'll let you know. I decided to sleep last night instead. ;) Also, if you get bored (because, you know, you don't have a ton of other more important dev work to to), you could also setup your game to be mixed-reality compatible, which is a very, very short list of games right now: https://developer.oculus.com/documentation/mrc/mr-quest/. Then you can show off your game like all those mixed reality Beat Saber game clips like this one:
I also recommend you create such a video featuring the most attractive woman you can find, because the VR world is still dominated by male players and we are small minded individuals. :P