The Zoom Slider widget provides a way to add zoom action control to a Px page video camera interface. This widget looks similar to a typical scroll bar and is designed to fit along one of the four bounding edges of a Live Video Player widget. The Zoom Slider widget is available from the videoDriver palette and you can drag it directly from the palette onto a Px page, as shown in Figure 38. After placing it on the Px page, drag the widget boundaries to adjust the size, position, and orientation, as desired.
The zoom action is initiated by clicking on the zoom icon 
that is located in the center of the zoom bar. Depending on how you orient the widget on the Px page, the zoom slider acts
as follows (see Figure 39):
-
Vertical orientation
When the Zoom Slider widget is oriented vertically, drag the zoom icon up to zoom-in and down to zoom-out.
-
Horizontal orientation
When the Zoom Slider widget is oriented horizontally, drag the zoom icon right to zoom-in and left to zoom-out.
In NiagaraAX-3.4 and later versions this widget supports Enterprise Video functions, if it is licensed for the “remoteVideo”
feature.
The speed of the zoom is controlled by how far up or down you move the icon and is indicated by the color changes in the zoom bar, shown in Video Playback view (Playback Viewer) and described in Video indicators.
Camera controls do not operate unless they are Enabled. Each of these controls must be enabled by selecting the option box for each control under the PTZ Support property on the camera property sheet. The default setting for these controls is Disabled (or, not selected).
For a description of the Zoom Slider widget properties, see Common videoDriver widget properties.