Just a heads-up: Several users of Opentrack have experienced stuttering recently. It seems to be related to the PS3Eye camera which may have been affected by a Windows update. The problem is that the fps of the camera fluctuates wildly between eg. 2 and 75 fps which leads to jumps in view position and stuttering.
The solution that worked for me and others has been to reinstall the PS3Eye drivers. In my case the drivers were exactly identical to the ones already installed but the process of reinstalling must have made a difference. The fps of the camera is far more steady now.