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You could use the garbage matte effect in Premiere for a real-time solution, or for a more sophisticated option, you can use the paint tool in After Effects. Using the clone brush you can sample other pixels in the image (like Photoshop) or sample pixels from other frames. This allows you to clone the background of a scene before the offending object appears in the shot.
If you could post some sample video or frame grabs, we can give better advice. The answer depends on what kind of background you're dealing with, etc.
Use the snapshot tool to make a still form the timeline.
Open it in photoshop. select all, copy and paste.
On the new layer, Use the clone tool to camouflage the boom mic.
In the layers tab, hide\mute layer 2.
On the background layer, draw a selection with some spare pixels around the boom mic.
In the selection pulldown, feather your selection by 1-2 pixels.
In the selection pulldown, select Inverse.
In layer tab, Un-mute and select layer 2.
Hit delete on keyboard to get rid of most of layer 2.
In layer tab, delete the background layer.
Save as .psd.
Import into premiere and put .psd on timline above the offending video clip.
I have attached JPGs from 3 clips.
Clip one had the mic visible to the left at the bottom of the shot and also at time the woman's leg goes behind it (example b)
Clip two has a computer monitor just visible through the door at the bottom left corner of the shot.
Help on how to deal with these or advice on books to read to help would be much appreciated.