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Corral traps are awesome. I've built one that had a trap door rigged to a bucket we filled with corn and a heavy pipe as the trigger. When the pigs get to really messing with the bucket and pull it around they knock over the heavy pop and trigger the trap door closed on themselves. Caught! Zero technology BUT you can't be selective like the guy in the video is. You get what you get.
The remote trigger in the video is nice but sim cards, cost, range and other rural location issues make it not so feasible in many applications. It does make me think of wiring up a solar powered router with a wired telescope style directional antenna on a pole that broadcasts long distances via line of sight. That way you could beam video and other signals back and forth to do the same "on-demand" remote concept with maybe much lower cost than sim card plans... provided you lived within line of sight from the home over the many acres to the trap sight.