We are trying to build a webapp for videochat that will run in a browser across platforms (desktop, iOS, Android).
At this time we are not aware of how to run webRTC in a browser on iOS -- it only runs in several desktop browsers and chrome for Android (e.g. peerjs).
Are there tools to get webRTC to run in a browser on iOS? Are there tools already built to create a webapp that runs webRTC on iOS by using a hybrid app approach (tools specifically for the hybrid iOS app, not just a webRTC SDK for iOS)?
When webRTC will be supported by Safari or Chrome on iOS?
There are frameworks like easyrtc theoretically allowing developers to write webRTC apps without needing to worry about browser-specific issues. However, webRTC is quite new and not completely stable, yet. As far as I know, webRTC does not work reliably for Chrome for iOS and not at all for Safari.
Update as of June 2017: WebRTC and getUserMedia are available in WebKit since iOS 11.
See also: Release notes from Safari 11.0