Use audio descriptions in the Apple TV app
Audio descriptions provide an audible narration of important onscreen action and content in movies and TV shows. If you have a video that includes audio descriptions, the Apple TV app can play them for you.
Turn on audio descriptions
- Go to the Apple TV app  on your smart TV, streaming device, or gaming console. on your smart TV, streaming device, or gaming console.
- Open the sidebar, then select Settings. 
- Go to Accessibility > Audio Descriptions.