实现VISCA 对云台摄像机的控制，云台的上，下，左，右，左上，左下，右上，右下，自动，及变焦，焦距，光圈，预置位巡航等功能(To achieve VISCA control of the PTZ camera, PTZ up, down, left, right, left, left, right, bottom right, automatic, and zoom, focal length, aperture, preset c