60. The method of claim 59 , wherein determining motion of the object comprises: identifying a first instance of the object contained in the ROI in the video frame; and obtaining a center point position of the ROI and a size of the ROI within the video frames.
61. The method of claim 60 , wherein obtaining estimated motion parameters of the object based on the tracking comprises: clustering the motion vectors representing the tracked motion of the object; and obtaining one or more estimates of the center point position of the ROI and the size of the ROI based on the clustering of the motion vectors.