For optimal performance with v200, the FaceTrackNoIR official site and user guides recommend:

If the webcam utility does not show an image or FaceTrackNoIR cannot see your camera, try the following:

The release of version v200 turned the software into a highly versatile, modular utility. Key improvements over older legacy versions include:

is an exceptional tool that brings immersion to simulation games without the premium price tag. While it requires a bit of patience to configure initially, the ability to control your in-game view naturally using just a webcam is invaluable. By focusing on lighting and fine-tuning the Accela filter and curves , users can achieve a smooth, reliable head-tracking experience.

This uses your smartphone's gyroscope (via UDP) to move the camera. While cool, v200 is less reliable here than modern apps like SmoothTrack.