Amazon said: "We will expand to additional Fire TV devices in the coming months, with YouTube TV and YouTube Kids launching later this year."
It added: “YouTube app appears in the Your Apps and Channels' row on all compatible devices.
Additionally, you can watch Amazon Prime Video on Chromecast and Android TV devices, giving Prime members unlimited access to their favourite Amazon Originals, live events, Prime Video Channels, and more."
This will enable users to access to a diverse library of video content. They can also play compatible videos in 4K HDR on supported TVs and streaming media players.