Well, I force control over the camera in my RPGMark example. I'm sure checking out the script behind it will give you some ideas here
It's quite possible to control the camera in GG and I haven't even tried the latest commands that are available; RPGMark only uses old lua commands - there are several new camera specific commands I have never experimented with which may be far better.
Edit - Of course 3rd person probably complicates matters
It may well be possible still, but as I say, there are a lot of new lua commands available which I haven't done any testing of. I've never tried lua scripting for 3rd person stuff, as by default it is still a little basic. It may well be you would have to script everything to be able to switch between views.
SPECS: Ryzen 1700 CPU. Nvidia 970GTX. 16 Gig Memory. Win 10.