Shot my first BIG gangbang today

3 hot Girls, all well up for it.
That said I promised the 30 or so guys anonymity, and I intend to honor that.
In all, it went really well, however, in the hour or so's footage, naturally a few times peoples faces were caught for a few secs or so or in occasionally faces were visible in the background.
I don't want to have to edit EVERY face out... That would ruin the flow and make it choppy...
What I would like to do, is to just quickly blur them out, like they do with the clubbing crowd in 'InTheVIP.com'
Doesn't have to be a wonderful effect, just an easy blur / pixilation to make them unrecognizable...
Never needed to do this before, and now I do and I'm stumped...
So, suggestions and advice please
TIA
PS
I'm currently editing the video on Studio 8 (DON'T LAUGH) but I'm open to change
