here my second component. Take a simple shape (better black and white), trace bring it in SOP world. A particle system with one particle that born and die along the shape is what is giving us the x y position of the around shape. Than we bring all in chop so we can use it as we want. Here a log of bugs : particle generation velocity, the movement are not so smooth if fast , complex shape can not be tracked really good. Method of use : bring a photoshop in, draw a shape stuff will move according to this shape.
Again commercial use is off only because i do not feel to suggest this method for a professional work, if you feel confy ... go on :-)... your choice.