Hello,
Things are changing for ARKit since I posted this. If you are using 4.20 and iOS 12, now you don’t have to do any more UV cropping. The passthrough camera texture doesn’t need anything connected to the UV input as long as you are in landscape-left orientation and it just works. For portrait you just have to invert the V coordinate and swap UV (U becomes V). This has been tested on an iPad Pro 10’’, but haven’t tested in a different size. I’ll try to post a node screenshot soon.