The sample code for OpenTok iOS SDK is available on GitHub: https://github.com/opentok/opentok-ios-sdk-samples
Pre- and post-production of audio or video streams
You can access and manipulate the audio and video streams by using Audio Driver and Video Driver APIs. Please see samples (2), (3) and (7) for more details: https://github.com/opentok/opentok-ios-sdk-samples
Screenshare
You can share your mobile screen with iOS SDK. Please see sample (8) for more details: https://github.com/opentok/opentok-ios-sdk-samples