Video Speed
The speed of the A/C can easily be computed once the frame count per second of the camera is known. The fact that the camera is panning right while the 320 is speeding left in the frames is irrelevant.
If one wanted to give the illusion of increased speed, the frames would have to be free of any stationary objects. Find a stationary object and use it as a reference.
Normal NTSC video runs at 30 frames or 60 fields per second. Surveillance video can run at any frame rate set by the operator.
So, talk to the guy who set the system up first. Then do the math.