We use multiscale image to analysis its saliency map (and do most of other jobs), mainly because it reflect in different scale level the apperance of objects. So in video, we should be able to use multiscale in time domain (multiple time span) to capture the motion of objects.
Salient features in an image are statistically distinguishable from the background (Rosenholtz,1999; Torralba, 2003). So the salient movements in an video are also distinguishable from the background, in motion feature space.
application in top my head: distinguish a ship from sea, find something in flowing water.
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