], toy data is created.  If rctS==0, the user is queried to
 specify the first rectangle.  rctE, denoting the object location in the
 last frame, can optionally be specified.  If rctE is given, the model
 histogram at fraction r of the video is (1-r)*histS+r*histE where histS
 and histE are the model histograms from the first and last frame.  If
 rctE==0 rectangle in final frame is queried, if rectE==-1 it is not used.

 Let T denote the length of the video. Returned values are of length t,
 where t