Try posting on comp.arch.embedded. There ought to be something
available, but if you don't find anything give me a call -- it sounds
like a fun development project, and I know enough about video to get it
done for you.
Why "embedded"? You can probably buy a USB video capture board and take
off the plastic shell... Making no effort to comparison shop, the first
suitable result on newegg:
Ben Jackson AD7GD
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