Drones are usually harder to fly indoors, giving the lack of gps (or very hard to connect to gps)
My 3dr iris quadcopter doesn't like to be flown indoors. The phantom 2 is easier to fly than the 3d robotics controller
I wouldn't trust my quadrotor over a crowd of people, especially indoors!
But anyways, nice video. You should add a gimbal to smooth that out, they work really nicely