Augmented Reality using C++ novel solution

Hi guys!
Please help me to decide :
Some proof of concept (real-time) - YouTube made with touch-designer in less then continues few hours.
(this is not the engine results, just proof of concept using simpler tracking method)

Im right now check the option for creating content mostly UIs
not necessarily games,using Novel Augmented Reality engine written with C++ to work in Unreal 4 or Unity.

I want the engine or the UI solution to work in mobile devices iOS\android too. (cross platform).

1.“How easy” is to acquire data from the mobile sensors such as :
Camera resolutions\FPS,Accelerometer,Gyro,magnetometer,sound etc… or just webcams or other external sensors.

2.“How easy” is to create UI with unreal and reference their inputs to the sensors and the custom made c++ AR engine or other external server\inputs etc ?

3.Any one can say how easy is to create the video I uploaded above with
iPAD or Android tablet using unreal ?
how long it will take for you to create something similar ?

4.How different is the licenses in case Im not producing games,but only UIs ?

I cant find many examples for “real” Augmented Reality content using unreal…

please feel free to share your thoughts.

Barak.