Blob detection

I was just wondering if it is possible to use blob detection to trigger a key board press. so if my hand went over to a certain part of the screen where i want it to correlate to the letter "w" for example it signals that "w" was pressed on the keyboard?

i have downloaded the blob detection library but im not to sure how to use it what i want to do is have 4 different buttons so when blob detection picks up the blob it that specific area it would either play a video or signal a keyboard press to play a video in resolume?


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