ptz_control interface
- Definition：
int _stdcall ptz_control(int camera, PTZ_COMMAND command, unsigned int param, DWORD wait_time);
- Parameter：
camera:[in]，Camera's handle which is from new_camera
command:[in]，The PTZ command, see the explain of PTZ_COMMAND structure
param:[in]，The Parameter of PTZ command
wait_time:[in]，The time waiting for repone, millisecond
- Return：
Return ERROR_OK if success，else refer to the definition of error number
- Explain：
Send the PTZ command to the camera. Makesure the camera has connected now.