I am conflicted between using servos, a gear motor with an encoder, or possibly even stepper motors.
I am conflicted between using a front end loader, a jack hammer, and a trowel to dig a hole.
It would be certainly easier to help you decide if we know what size hole you needed, in what kind of material. A hole in topsoil to plant a bulb is one thing. A hole for a swimming pool, in glacier runoff, is something else.
How much weight are you moving? How fast? How accurately are you trying to position the camera? What problems are you having?
Servos can work very well, but the $5 ones are not very accurate, fast, strong, or precise. Gear motors might work, but stopping them at precise positions is hard. Steppers are strong, precise, repeatable, but not terribly fast or cheap.