Gyroway specialises in drone stabilisers but they like to do crazy demos sometimes. (see this one where they dangle a gimbal at the end of a fishing pole) https://www.youtube.com/watch?v=NE5m-yGTxqU
As with all 3 way gimbal stabiliser, only pitch, yaw and roll are compensated.
Camcorders on the otherhand have more axis of stabilisations but can only handle minute deviations.
Whereas gimbal stabilisers can overcome extreme angles. Results really depends on the type of camera movements.
Extreme pitch and roll may be a major problem in drone flight but I find that yaw (unintended micro-pans) is more pronounced in handheld shots. A 3 axis stabiliser will be able to take care of that but it means precise tilting and panning has be by electronic control. Vertical translations from walking in fact looks less pronounced with builtin 5 way stabilisers such as OMD-EM5 But more pronounced updown bobbing from running however is very hard to eliminate short of using a vest and springed arm system.
So perhaps the best solution is a combination of incam 5 axis stabliliser, 3 axis brushless gimbal mounted on a vest and spring arm!??