I recently shot an interview that looks great. the problems comes when the interviewee looks up there is a booger in his nose. It there anything I can do? I have tried tracking but the subject moves so much. once I do track it then what?
Any help would be appreciated.
Read up on cloning, masking and all the good stuff.
Basically, you would need to create a clean nose hole (cloning), attach that clean nose hole to your tracking data (which you should apply to a null object), and then use rotoscoping (or masking) to make it fit in the shot.
Stabilize motion (type that in the search help field at the top right corner of AE to find out how to do it) then pre-compose, remove the booger with cloning or by adding a clean nose hole, then remove the stabilization from the footage and add the stabilization keyframes from position to the clean plate and you're done.
If none of that makes sense then you'll have to study up on the basics of AE because these are basic AE skills you should learn.