The arm of the crane can pivot along two axes around the base, uses a parallel bar mechanism to keep the camera orientation constant through its vertical range of motion.

[Alexandre Chappel] also built a camera crane a while back which utilized a completely different arm mechanism. As cool as these are, they still pale in comparison to [mingul]’s workshop-sized 8 ...

That’s why the crane and camera head can move around the car in a 360 degree circle, while it is being driven at high speeds. It’s like the ultimate rollercoaster.