This is a software for DSLR's/mirrorless and other 'Full-fledged' cameras, not webcams. Macbooks do not have an hdmi in, and passing video through usb wasn't a standard for those cameras until lately (and still isn't). So macbook or windows didn't matter in this case.
It's a custom driver for Mac, so it will not just work without additional driver support of some sort. There is a standard USB webcam protocol, which the cameras' firmware does not implement, in favor of this: https://news.ycombinator.com/item?id=24793187
chances are they work on mac, they'll work on linux too.