The person knows no cameras exist doing gait detection, but wants one. They make a random comment on HN, a forum known to be read by people that is full of people will take an idea to completion "over a weekend", as a challenge to get someone to do something for $1000. That's a ridiculously low amount for something to come into existence that would serve their need directly. Hell, there's probably people here that would do something like this for the clout.
No, I know that where security cameras are positioned and the amount of processing they currently have there will be no gait analysis being done on the camera itself. They have enough trouble telling one person from another reliably.
I was being facetious as I don't believe hackernews readership is that enterprising.
