In the last year I’ve been investing quite a lot of time in bringing opentrack back to the Mac:
I’ve made the code changes available in my fork. Some have already been merged to the original codebase.
I now provide codesigned and apple-notarised pre-built binaries via gumroad allowing you to support my work.
I’ve also published a detailed guide about how proper IR-Head-Tracking is now possible on macOS using products by DelanClip. It performs much much better than any facetracking solution you might have looked into in the past. Get a 5% discount using this link.