OpenCV iOS port has no video

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I'm trying to get an OpenCV project up and running on iOS, and have recreated the video capture example found here: https://github.com/Itseez/opencv_for_...

I've made sure all the frameworks were imported, and modified the building settings accordingly. However, no matter what I do, no video is ever displayed. How can I fix this?

iOS version: 10.3

Xcode version: 8.3

OpenCV version: 3.2.0