73. The method of claim 72 , wherein 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 comprises: obtaining a first set of estimates of a center point position of 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.
73. The method of claim 72 , wherein 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 comprises: obtaining a first set of estimates of a center point position of 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. 76. The method of claim 73 , further comprising: responsive to total computer resource exceeding a predetermined threshold, scaling complexity of at least one of the object tracking processes temporally.