You can actually manually run it without headtracking by hooking to CH3~4 via switches. However majority ground FPV'er uses air controller that have trainer port which is hard for serious ground racing. But for my solution on all my ground FPV with RadioLink RC4G (no trainer) 4ch controller i hooked my head panning servo inside my car tapped through steering channel or on CH3 with steering mixing. When i steer left or right the camera pans along with it which is great for FPV racing. Below are sample of my FPV ground video with pan camera.
Videos:
Here is link of how i setup mine:
Links: https://www.supermotoxl.com/designs-...-micro-crawler