If you're interested in using a mirrorless or DSLR camera you have lying around as a webcam on Linux, I recommend this article: https://www.crackedthecode.co/how-to-use-your-dslr-as-a-webc....

If you're using a Mac, this article is the best I've found, though the CamTwist Studio setup is a bit slow if you don't have a Macbook Pro with 16GB RAM or more: https://www.nicksherlock.com/2020/04/using-a-canon-dslr-as-a.... I plan on writing a more comprehensive article for Mac users in the future.

All the steps are free! No paid software or hardware needed.

I've taken to doing this, and while the setup is a bit tedious, people are always super impressed with the bokeh and all-around nice quality of my "webcam." I haven't told anyone it's really a DSLR yet.

With my camera quality, I feel like Bill Gates with his camera setup (see: https://www.youtube.com/watch?v=iyFT8qXcOrM).