WatchKit In-Depth, Part 2 – WWDC15

WWDC15Move beyond architecture changes for Watch apps and explore the different ways you can use the Digital Crown to enhance your apps. Find out how to create persistent app experiences to keep your Watch app at the ready for users and learn how to use the playback and recording APIs to add audio and video to your Watch apps.

Sample Code:
Lister (for watchOS, iOS, and OS X)
WatchKitAudioRecorder: Audio Recording and Playback
WatchKitMoviePlayer: Using WKInterfaceMovie for Video Playback

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WWDC 2015 > App Frameworks > WatchKit In-Depth, Part 2