Why would you need a filter to do that?
Couldn't you simply use BSPlayer's in-build possibilities to resize movie-window?
E.g. look in the "about"-information, of which I hereunder quote some lines by way of example.
Quote:
Keys on Numeric keyboard in full screen mode +/- Zoom in/out movie and keep it centered 4,6,8,2 Move picture left, right, up, down Ctrl and +/- Zoom in/out movie Ctrl+4/6/8/2 Free resize movie Left,Right,Up,Down 5 Reset
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Don't those features meet with your requirements?