If you have the LCD auto dimming mirror, there is 12VDC which is switched with the ignition. The wire gauge is small and not going to carry much current.
I would check the circuitry before trying the following:
I would by a camera which shuts down a few minutes after it no longer detects the vehicle motion and wire it to the main power for the map lights. The accessory power will shutdown a few minutes after the ignition is shut off. If you don't car about some extra recording until the accessory power shuts down, you can use your camera.
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Cary, NI2Q - Amateur Extra Class