TVideoGrabber - onMouseMove

[danten]

Hello,
How can you when onMouseMove the mouse up, down, right, left, perform ZoomXCenter and ZoomYCenter without trackbar.

VideoGrabber.ZoomXCenter := TrackBarZoomX.Position; (left and right)
VideoGrabber.ZoomYCenter := TrackBarZoomY.Position; (up and down)
VideoGrabber.ZoomCoeff := TrackBarZoom.Position; (wheel)