One person, in a crowd is in normal speed while everything else zooms past

I have wanted to do this effect for a while. I want to film a peson walking on the street normally while everyone else zooms past. I posted this same message last fall, but I never got around to filming it, and was unclear about it. I pretty much understand the concept. locked off tripod shot. FIlm the area with nothing in it. film the person with the backgroung. then shoot the people you want to zoom past. Everyone tells me to use difference mattes, but I can never get them to work proporly. Can any one take me step by step in the editing side, as if I have already shot this. I want to use this effect in my next film school project. I would really appreciate any input on this
thanks
Stephen...

v1: (background) crowds in street (sped up as required)
v2: main character - isolated from empty streets background using difference matte
v3: (foreground) crowds (sped up as required) - isolated from empty streets background using difference matte
you could do it without v3
the main thing in this effect is not the post production, it is the production and pre-production. think about the lighting in the different versions of the shots and how that will affect your composite. you need to choreograph everything, make sure your talent and the "crowds" understand exactly what is required of them, down to the smallest details. thats what will make or break your shot.
and, of course, if you don't have the resources necessary for all that, then you need to scale down your expectations respectively
as to how to use the difference matte:
apply the difference matte to the clip, open the clip's filters tab, and in the difference matte settings drag and drop a still frame of the empty streets background onto the "Difference Layer" image well. adjust the threshhold and tolerance sliders to fine tune ... if the key obtained is not quite perfect, it should still provide a good starting point before going in, frame by frame, to clean it up with garbage mattes etc as required

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