We have recently upgraded openvidu version from 2.17 to 2.20 since then video steaming has stopped on iOS devices
Hello, is your app based on OpenVidu tutorials? Did you upgraded your iOS app in conjunction with the server version?
It would be great for us to help you if you deploy a temporal server and send us your Openvidu server url to check what could be wrong. (via PM or email).
Regards.