Thanks for the help, that seems to be the right direction. Unfortunately for me it's to much programming (as in hacking on your keyboard instead of wiring). Don't know if I'll be able to figure out how to build this.

What I need in the long run is a software with a timeline and keyframes animation ...

Yeah thanks for the PID, that's certainly a piece of the puzzle.

I was thinking about face recognition and so on, but dismissed it, assuming it would have a notable latency. I thought it would be easier to come up with a math formula or something to calculate the angles of a virtual triangle. Like ...

I'm studying film and am currently trying to build a motorized slider and a gimbal for my camera. Unfortunately I'm not a programmer nor a robotics expert by far and time is of the essence. I can handle node based programming interfaces like flowstone, but I'm not sure if it's capable of what I need ...