How to avoid signal interference between 5 volt analog video signal and 415 volt servomotor and drivers, when working nearby
Try a common-mode filter on your camera cable to reduce the aggressor noise. Test a clamp-on ferrite bead to start with.

Try to route the servomotor wiring in pairs that cancel each other.

Make sure that there is no ground loop from the motor sneaking back through another path: isolate its return.

Apply filter caps across the motor phases to reduce transients / ringing. (Make sure the caps are rated for this.)

Look for ways to control the spectrum of the motor drive signal (e.g., reduce slew rate, filter PWM hash better, etc.)