I can see two particular issues - your pitch/pan inputs seem very sharp (is there a setting to calm that?) and there's a jerkiness in the footage suggesting, to my amateur eye, a looseness/slop somewhere in the system. With the camera mounted and the gimbal powered up, gently grip the front of the lens. If you can move at all, in any direction, there's something wrong.
What lens do you have on the D7000? Is the lens mount metal? Some of the kit lenses have plastic mounts and I've seen some with actual visible movement between the lens and the body - not good, since if you can move it then so can gravity.