Someone here has already tested AITrack + Opentrack. AITrack works together with Opentrack, it works the same as FaceTrackNoIR (you don’t need to use leds like a Christmas tree) it tracks your head and then transmits to OpenTrack. It is much better than Facetrack as it works in low light environments, and if you don’t have a webcam you can even use your SmartPhone(DroidCam). The latest version of AITrack is v0.6.5 (you can download it from the website by clicking on the right side of the page under releases). It doesn’t need to install, just unzip it somewhere on your HD and then click on the executable. In OpenTrack Input (choose option: UDP over network). The latest version of OpenTrack is 2021.2.0(running bug free with Win10). See the explanatory video:
https://github.com/AIRLegend/aitrack
https://github.com/opentrack/opentrack/releases