(Where X,Y is the origin of the rectangle indexed from upper left and WxH is the dimensions of the rectangle.)
+To obscure that same object in the frame, try this:
+
+ > inigo -filter autotrack_rectangle:X,Y:WxH obscure=1 <movie_file>
+
+There is now a slow motion producer that does interpolation based on the motion vectors:
+
+ > inigo slowmotion:<movie_file> _speed=0.1 method=1 debug=1
NOTES (and deficiencies):