What is the best pratice to take input video frames from AXIS PTZ?

edit

I attempt to develope a OpenCV app based on AXIS PTZ camera. It has a SDK but I could not really find out a way to get frames into OpenCV matrices. If there are some experienced ones, could you tell me the best practice to use AXISPTZ with OpenCV?

Basic expectation is to direct PTZ camera into the motion on the scene to be more precise about the project. For instance it will direct to the guy walking on a parking lot.