Thanks for your answer, but that doesn't completely clear everything up for me..I want a camera exported, not a box in the second method(though I guess you could parent a camera to the box later on, but that seems kind of not elegant..xD).
As for the first method you mentioned, I have no idea how to serialise ARCam data and save it to an appropriate file , could you kindly help out? : )
I just want the easiest way to further handle the data. I tried using Coremotion, but the output not usable