Bamboo canes (1 or 2)
Some cable (zip) ties
A small handheld drill
Some tape (pvc electrical, or duct)
A junior hacksaw to cut bamboo pole to length (if needed)
A kite (I used a 2.4m2 cirrus kite)
A camera that can take a rough landing (I'm using a Kodak PlaySport outdoor camera, but GoPros would also work)
The basic theory is that kites produce quite a lot of lift, so adding a bit of extra camera weight shouldn't be too difficult.