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You don't need to harvest a constant 20 fps. Every 30 seconds take a frame capture. Do a Haar transform to crop out candidate faces and upload to server that does the heavy recognition lifting.

I guess it depends what their use case is. In 30 seconds, a lot of people have walked past you unrecorded.

Until they work out the heating issue and start using an external power supply, they possibly could trigger it manually (picture instead of video).

I guess it could be on demand, and handled server-side. Uploading an image every once in a while doesn’t use much energy.