Once upon a time, WB claimed it worked with the iGlasses brand of head-tracking VR set up, but I never found out exactly how they implemented it. iGlasses were actually fairly inexpensive ($500-$700) and would track both vertically and horizontally to very high angles. Unfortunately, the resolution was rather poor. I played with one in a computer store playing MechWarrior. They worked great, but I couldn't read most of the text, and gauges would be very hard. I believe EF-2000 supported them, and worked pretty well. Poor resolution has been the bane of VR systems, and they've not managed to produce a cost-effective set up for the general public. However, some defense contractors have been messing around with some really hot set ups for a number of years.
Sabre/Rojo