Gustavo: I'm not sure I understand your question? Are you asking just about gimbals (you posted your question in "3 Axis Gimbal" -- or are you asking about copters? Andy.
That's a complicated question. There are a number of factors... are you flying in an indoor stadium or an outdoor stadium? what's your intention, assuming you're doing aerial photography or video? and if you're really talking about "autonomous" flight, you're a few years too early. Much of your potential for success is going to depend on the usual factors: structural, electrical and control system integrity of your machine skill of the pilot preparation of safe takeoff and landing zones rehearsal of an air-tight safety plan In other words, there is no easy answer to your question.
Well, I'm talking about something like a multirotor but with more autonomy flight (duration in the air) but less dangerous, that can carry a heavy camera on a 3 axis gimbal, maybe as a blimp.
I've moved the thread to Cinestar Misc (miscellaneous). If you're going to be flying over people and you are in the USA, the FAA has issued a NOTAM that makes it unlawful. If you are not in the USA, how good is your insurance? Andy.
This is not an optimal place to discuss blimps (or zeppelins, for that matter). AFAIK, small, indoor airships are actually not able to lift very much weight. You'd be surprised. And they have their own set of liabilities.
Cable cam is your best bet. http://www.cablecam.com/default.aspx Best of the best, friend has one and we just installed a M15 on it with a Dragon. Works great. Takes 2-3 hours to setup and "flys" just like a MR. Blimps suck. Did a pair of epics in the air a few years ago on a blimp and it was terrible. The blmips were 150/m3 for a 30lb payload. If they have propulsion they are even bigger, and more dangerous. We were at the mercy of 30mph winds for two days and the cost to break em down and refill cut into the budget in a HUGE way.
Well, I'm asking to know that can use, definitely a multirotor is indisputable that under no circumstances , cable cam is one different option but limited, is my opinion. Check other indoor
Cable cams are not very limited. I have been considering buying one due to the numerous places that are a pain to fly that I get asked to setup. The good 3 axis systems "fly" just like a UAV and frankly are much better then any blimp as you can run a real camera on them, and they are MUCH safer.