I get how to rotoscope and I get the pen tool but I can't figure out what parts of the clips I have to outline.  In some scenes, there are faded out parts that show movement from the past frame.  When I want to cut out the backgrounds, do I include those faded parts in my pen tool selection or not?
Pic shown as examples:  Do I delete the parts in the circles when I want to delete backgrounds or do I have to keep them?
 
