The camera is rated at 2 watts of power with a voltage of 5 volts.  A 5 volt regulator running off a 12 volt battery will get very hot after a few minutes, and the regulator will shut down form overheating.  The 7.2 ah battery will not last very long either.  Perhaps a better solution would be a high current (5 amp.) 5 volt low head-room regulator running off a 6 volt golf cart battery.  You might also consider using that 6 volt battery with a 5 watt silicon diode in series with the positive lead of the battery, and thus eliminate the regulator.  Note also that the regulator needs to have a heat sink to keep it from overheating.
Regards,
Bob