[sarcasm on]
I find a little piece of wax paper kind of just blurs the screen and the logo so you still see the light through it and not a hole in the screen.......
Seriously though, frame by frame photoshop each one out? Then reassemble all new images.
Sure there's stuff that can blur or block out unwanted parts of a video, but then again most people probably want things left unmodified, wouldn't they? If you don't have a source pre-graphics why pretend you do by artificially removing them badly. Other than doing it by hand one by one you're still going to get crappy results unless you go to Pixar Animation or something equally ridiculous.
Save your time and money and make your mind erase the unwanted stuff on your screen. If that doesn't work, go read a book.
[/sarcasm off]
I really don't know.
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