Have been tinkering with OBS: https://www.rightpoint.com/thought/2017/12/19/improving-your..., https://streamshark.io/blog/chroma-key-software-live-streami...
I'm looking for an actively-developed macOS virtual webcam tool, as CamTwist's website is showing a PHP error, and their Mac software doesn't seem to be notarized: http://camtwiststudio.com.