new_camera interface
- Definition：
int _stdcall new_camera(CAMERA_DESC * desc);
- Parameter：
desc:[in]，The describe of a camera
- Return：
>= 0: Success, return a handle of the camera.
< 0: Fail, return a error number.
- Explain：
Register a new camera handle, it must be called to get a handle before calling other interface about access the camera.