IOCTL_VIDEO_QUERY_POINTER_POSITION control code
Returns the current position of the pointer. Support for this modal request is optional.
The miniport driver returns a VIDEO_POINTER_POSITION structure in the VRP OutputBuffer.
If the miniport driver successfully returns the pointer position, it sets the Information member of the STATUS_BLOCK structure to sizeof(VIDEO_POINTER_POSITION); otherwise, the miniport driver sets this member to zero.