It's not just on iPhone, that demo is not very good, I think it just takes a single frame and makes it grayscale. Try these: https://huningxin.github.io/opencv.

It's not just on iPhone, that demo is not very good, I think it just takes a single frame and makes it grayscale. Try these: https://huningxin.github.io/opencv.js/samples/ https://huningxin.github.io/opencv.js/samples/