Face pixelation – Maybe a change in idea is needed?

I have tried various ways to change the code so that my face is pixelated and not the rest of the video. Most attempts ended in a blank video or just the video with nothing happening at all. I have got as far as one pixel on the screen being over a face when it is detected but the rest of the video is still pixelated. I think my next steps may be thinking of a new idea, as being new to this software makes what should be simple quite hard to complete.

Screen Shot 2015-01-14 at 20.45.47

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Face pixelation – Maybe a change in idea is needed?