In September 2014, Apple announced some news for app developers including “App Previews” in video, which allow them to present their iOS and OS X applications more immersively on the (Mac) App Store.
Today, Apple announced the expansion of these “App Previews” to tvOS. That is, very soon we will start to see apps and games on the Apple TV App Store with video presentations which is great.
In this support article, Apple details how these videos should be created. There are specific resolutions for each device in the case of Apple TV the video must be in Full HD (1920 × 1080 pixels) and they must be between 15 and 30 seconds.