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java support is pretty new, best place to look for (upcoming)samples, is probably here

the first thing you'll want to look into is skin / contour detection

maybe it's already enough to find your hand / color blob in a certain position

or you could record & save the outline of your gesture, and call matchContours() on a candidate blob from your camera for comparison.

there's also a function to find convexitydefects in the outline, if you want to count fingers