I believe that's the DraganFlyer:
**broken link removed**
Also just search eBay for "draganflyer".
It rotates 2 rotors in the opposite direction from the others to avoid net torque. I imagine it can even correct slight imbalances by shifting the load from one pair of rotors to the other to create a corrective torque reaction.
They do sell an optional camera.
Also go to eBay and search for "electric helicopter" or "dragonfly helicopter". Lots of neat stuff available today, and at a bargain price!
Any propeller gets more efficient as it gets larger. I think they may use the same size prop though, the DF has 4 of them but only flies for 5 min (and costs $900!). The single rotors claim 10 min, and that's on a NiMH pack, the DF only gets those 5 min with a higher capacity/lower weight lithium ion pack. But the maneuverability that comes with 4 rotors as well as the gyro is pretty cool.
There are also some really fun cheapo toys, though many don't actually have any useful controls in the remote (ON/OFF). I got a Blackhawk 3 rotor which is fully controllable, but corded. On the plus side, it doesn't run down and you can use it for hours on end. It has no torque compensation on purpose and the whole body spins. It uses an infrared sensor to orient its spinning self by looking for the infrared transmitter on the remote control. The power/control cord has slip rings to make the electrical connection without twisting up. I had endless fun swooping it back and forth, it was really difficult to keep stable but that was half the fun. Eventually a little plastic pressfit pinion gear broke, so sadly it's down for the count.
There are probably a lot of RC groups who can tell you exactly how much weight a particular rotor can lift. But the lifting capacity, as well as the run time, is VERY limited. So you'd probably be restricted to the lightest camera made, lots of fun but don't count on a quality picture. Gas helicopters can lift much more and run much longer.