I'm working on dozens of OpenTrack compatible game mods all of which are being released under the MIT license, 9 are out now and can be found on GitHub/Nexus Mods:
https://github.com/itsloopyo?tab=repositories&q=head+trackin...
https://www.nexusmods.com/profile/itsloopyo/mods
In the linked video I discuss my iPhone app, Headcam, and the library powering its absurdly responsive video streaming.
If anybody would like to try it, you can join the TestFlight beta at https://headcam.app