Lag might make it less useful than it sounds. It would be kind of like riding along for gunnery, you'd only be seeing an approximation of what they're looking at, on a delay. TrackIR I think would be right out. You'd be further ahead riding along at the time, then getting them to send you their video and watch it with head motions enabled in the film viewer, assuming they're not using trackIR.
Wiley.