At a company party in Uitikon (near Zurich Switzerland), I filmed a fire eater (although his eating didn't work out very well). Although it doesn't look like it, the flames came to about 60cm from the Gopro, and the hexacopter wobbled pretty violently in the updraft of the hot air :)

Filmed with Gopro 3 with a Zenmuse gimbal under a DJI Flamewheel 550.

I created this video with the YouTube Video Editor (http://www.youtube.com/editor)