3.9 Zoom-in / Zoom-out
For cameras that support zoom-in / zoom-out function, you can use this function to see more objects that fall in the scope of camera‟s view, or enlarge the image size of a certain object to see its detail.
Please select a camera in video displaying area by clicking on its image, then click
button to see more objects that fall in the scope of camera‟s view, or click 
to enlarge
the image size of a certain object to see its detail (Before zoom-in, you may need to use PTZ buttons - described in next section) to find an object you wish to see its detail).
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