Apple TV users can run the app directly on the Apple TV (not via an iPad) It appears as a 1024×768 image (or whatever your TV can fit) on the monitor with black bars on each side. You could easily do this before by mirroring your display wirelessly. However unless the app has specific code in it for mirroring, it appears as an image on the screen. We are hoping Apple eventually provides natively an app store for Apple TV – something we are hoping for natively.”]
Source: https://gizmodo.com/watch-a-hacked-apple-tv-run-ios-apps-full-screen-5872397