If the game allows you to look around with a gamepad thumbstick, you can configure the head tracking as gamepad axis in the vorpX ingame menu and then change the ingame gamepad binding accordingly. In many Codemasters recing games this allows you to get head tracking working (quite laggy usually though).
Another workaround would be to play in Virtual Cinema Mode (ambience scene) and then move the screen closer until the image fills the whole view. That doesn’t give real headtracking, but works surprisingly well for racing games od all kinds.