http://wccftech.com/nintendo-switch-update-4-0-0-video-capture/

Nintendo Switch ( Amazon, $299.99) Update 4.0.0 has been released by Nintendo which adds video capture for select games, including Zelda: Breath of the Wild and Mario Kart 8 Deluxe.

The update allows players to capture video up to a maximum of 30 seconds and will be saved to the album where it can be trimmed. This feature is available now in Zelda: Breath of the Wild, Splatoon 2, ARMS, and Super Mario Kart 8 Deluxe (via today’s patch for the game).