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Raymond, The capacitor is a good thought, but the cameras I measured (similar to the one I installed) take from 85 to 120 ma. and require a minimum of 7.5 to 10.0 volts to operate. If you take the best case, 85 ma. allowing the voltage to drop to 7.5 volts, it would take a 50,000 mfd capacitor. I located several on Ebay ranging in price from $41 to $84, they are about the size of a Coke can. Yeah, I did briefly think of that option.
Or just drive a low-current relay coil with a much smaller capacitor - while powering the camera's circuit with the relay's 12 volt output.
 
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