I need to solve a canvas issue on the iPhone (Safari)

I built a video player, a canvas, to send videos to my contacts. It plays a base video, and on top, we overlay text data. It works fine, especially on Chrome, but on the iPhone, it never works. I believe it's because there's a CORS (Cross-Origin Resource Sharing) issue, preventing it from fetching video frames once they are cached. Additionally, the canvas doesn't work properly for writing text (within Safari). I need someone knowledgeable in this area to help solve this problem.