How to control servo motor using arduino-processing combination?

Using Arduino Project Guidance
1

I am working on a project in which I am developing an automated witness camera for home surveillance.
I am using arduino leonardo for it.I am done with the arduino part in which PIR sensors sense obstacle and stepper motors move the camera in that direction and camera captures image.

I want to use processing for controlling stepper motors interfaced with arduino .Please help!!

2

Which part are you stuck on? Presumably you know what Processing is and know that it can communicate with the Arduino, and you know that the Arduino can control stepper motors. There are plenty of examples around of both.