This person used computer version to build a keyboard input, and used standard flag semaphore for the positions.
Flag semaphore is used mostly by sailors to be able to communicate optically over a distance; it does not need anything more than make-shift flags (but binoculars or telescopes can help.) Trained users can go faster than you might guess.
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Amazing talent
@Walter Roberson The proposition appears to be highly favorable. I have access https://www.youtube.com/watch?v=h376W93gQq4