A little off topic: has anyone managed to have chroma key effect on Mac ? I'm also thinking to have almost same concept youtube channel. But, I also want to have chroma-key background. any ideas ?
Also look at Black Magic ATEM Mini https://www.blackmagicdesign.com/products/atemmini - you need to connect a camera with HDMI output to it (i.e., something like a Panasonic G7) rather than a webcam, but it'll do the green screen in-device and output an HDMI signal. You can then run that into a USB3 HDMI capture device that will show up as a normal webcam.
The Zoom app, and the Logitech C922, each have live background replacement ("virtual green screen").
For post-production without a physical green screen, you can use a green rectangle as your virtual background in Zoom or with the Logitech, import into iMovie etc., and chromakey there.
That would be awesome to be able to switch scenes from OBS inside a "corporate" video conference setup.