Is the gas powered .90 sized Raptor R/C Helicopter capable of lifting a Canon G5 digital camera?

Yep - surprising payload capacity - try a video camera or stills . These are used for making videos of large tracts of land where real copter flight is prohibited.

Yes the 90 will haul the load. Don't forget to use foam around your camera mount to prevent the vibs from affecting your pics.
Good Luck

And, no fair flying over the nudist colony!