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Camera is not working when I export a working code onto an Iphone

Hi guys

I created an AR program designed to look a piece of art work and then put a 2d image over it to show what the painting was of. I followed this tutorial https://youtu.be/MtiUx_szKbI and it worked on my computer using the built in webcam but when i try to export it onto my Iphone 7 running an up to date operating system using XCode when I opened the app it just did the default unity boot up and then just black screen. Any help would be appreciated.