This example demonstrates how to play YouTube videos inside an Apple TV app by bridging JavaScript and native Swift code. It shows a custom `YTPlayerViewController` that uses the `AVKit` framework’s `AVPlayerViewController` alongside the `XCDYouTubeKit` library to retrieve video streams. The code integrates with `TVMLKit` by evaluating a JavaScript context, exposing a `playYTblock` function that native code can call. The video player selects from available stream qualities (e.g., HD720, medium360) and automatically dismisses the player when playback ends, using notification observers.