Mac recording software
OBS Studio is multi-platform and is really your only option https://obsproject.com/
There might be other ones, but they are probably not as well maintained or supported. It will allow you to stream to services like Twitch or you can local record and have the video saved on your computer (then you can upload it to YouTube or do whatever you want with it).
Zer0z, Mac has quicktime inbuilt. You can record full HD with high FPS on any mac made in the last 5 or so years. It should be installed already.
Edited by the author