Do you know where you saw that video? I designed and developed the stabilization software.
it was on some youtube vid around the time of the Iraq war. maybe a year or 2 after the start. the tank was doing tight figure 8s on a grade that was about 6 to 10 feet out of level. going up hill and then back down and the whole time the barrel is locked dead nuts on the camera.
if you designed that, two thumbs up to ya!!