Moving Servo With İmage Processing

Hi everyone!
When flying autonomously with my drone, drone seeing a red mark on the ground and it should move a servo that I set.
How can I do this in the simplest and most effective way?
Is this possible?

I’ve seen a lot of videos about Precision Landing with Image Processing.
İ guess its work similar. But I just want to move a servo.

İ want the precision unloading

Anyone Helps?
İ have Holybro Pİxhawk 4
Raspberry Pİ 3 and Raspi Cam