See here:
http://stayblcam.com/
https://www.kickstarter.com/projects/1462553184/stayblcam-super-steady-video-with-iphone-gopro-and
It's basically just a 3 axis gimbal that collapses like an umbrella when you're not using it. Obviously this wouldn't work with dslrs but for those that use gopros, what do you think?
I was planning on making a DIY job to use over summer, but might not bother if this thing proves to be alright. (Sub par) Gimbals are easier to make than I thought.