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Correcting GearVR display matrix

I'm developing for GearVR, which unfortunately is not supported using Vuforia 6.5

I have created my own application with camera feed with VR mode enabled (Oculus SDK). However, one major issue is a distorted camera image in each eye (see attachment). 

Trying out Vuforia i see it is possible to counter this distortion, and i was wonder if it is possible to replicate the calibration steps using Vuforia in my own application.  

I've been thinking i need to take my byte[] stream and use a custom matrix multiplication in order to fix it, but i have no concrete idea on how to do this. How is this camera calibration done in vuforia? The documentation does not explain it.