103. The computer-readable storage medium of claim 100 , further comprising computer program instructions for: responsive to total computer resource exceeding a predetermined threshold, scaling complexity of at least one of the object tracking processes temporally.
100. The computer-readable storage medium of claim 99 , wherein the computer program instructions for tracking the object contained in the plurality of video frames capturing the visual gesture by the motion-assisted object tracking process and the secondary object tracking process in parallel comprise computer program instructions for: obtaining a first set of estimates of a center point position of a the ROI containing the object and a size of the ROI based on the object tracking by the motion-assisted object tracking process; and obtaining a second set of estimates of the center point position of the ROI containing the object and the size of the ROI based on the object tracking by the secondary object tracking process.