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The trouble with peltiers is that if you just apply voltage and leave them running they work flat out at maximum amps / cooling. You could end up freezing your cam depending on what size peltier you use (often rated in eiter amps drawn, r watts consumed). Remember that these things are basically a heat pump - give it max power, it keeps pumping heat at max capability.
Better applications usually have some form of control that limits power drain (and maximum heat pumping) by either modulating the duty cycle (ie power switches on and off rapidly so it is effectively only on 40%, 60%, etc of the overall time) or by thermostat (temperature sensor) to switch the unit off when desired temp has been reached.
Dock Smith have a kit for an electric motor variable speed controller used for drills, etc this is a "duty cycle" control type design, can be used for peltier control.
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