Using Camera Lens Blur Filter / Mask

I have a question concerning the lens blur and I hoping someone can point me to a good tutorial.
I have several interview segments and I would like to do a small digital zoom at the end of each clip. The background is slightly out of focus already and it doesn't look natural to zoom when the bokeh is not changing.
I have a good handle on the filter but I am not that experienced with advanced mattes. I need to learn how to get the matte on the person and stay during the zoom so I can manipulate the background. The subjects are seated on a stool so their is very little movement.
Did some searches but I am probably not searching the right keywords. Can anyone point me in the right direction.
Thanks.

Masking? Rotsoscoping? I can think of a million ways to create separated layers or mattes and then duplicate the layer and invert the masks/ matte, but if you never have used that stuff before, you will hard-crash on concrete and not get very far, I'm afraid. It takes at least a bit of practice to produce a clean matte. As a palce to start you may get by suing the Rotobrush and see, if it produces clean enough edges, but if not, it's proably better to scrap the idea before eitehr ending up with a bad result or not meeting your deadline...
Mylenium

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