Traditional helicopters use three variables to control their
flight: Collective, which is where the pitch of the main rotor's
blades are all increased by a fixed amount to increase overall
lift, cyclic, which is where the pitch of the main rotor's
blades are temporarily increased every cycle during a certain
part in their rotation to generate more lift in one direction
and control roll & pitch, and the anti-torque pedals, which vary
the pitch of the tail rotor blades to produce yaw. There is a
well-developed community of RC helicopter users. Control systems
on helicopters are inherently suited to a single source of
power, and this means that many of them use internal combustion
engines rather than the batteries used in multirotors. The way
that the miniaturization ended up being economical, hobbyist RC
helicopters ended up being rather large, with dangerous blades.
As such, they've been available to lift the relatively trivial
weight of a camera for a long while now, and many commercial
aerial photography pro