You didn't answer my question about horiontal and vertical.
An Arduino Uno should be fine for two motors. If you are using stepper motors you will need an appropriate stepper motor driver board that can comfortably handle the motor current.
If you can't describe the mechanical design it will be impossible to advise about motors.
You mention 180deg and 60deg. Does that mean you just want to rotate the camera in two axes? Can you arrange things so the load is balanced to reduce the force required from the motors.
If you are just rotating the cameras have you considered using servos rather than stepper motors? They would be much easier to use both mechanically and programmatically.
...R