As of the 4.0 Switch update, only four games (Splatoon 2, ARMS, Mario Kart 8 Deluxe, Breath of the Wild) support video capture. It's a small concession in that it only provides 30 seconds of capture time, but it's there, and you should probably have all of the information when it comes to which games support it so you don't haphazardly mash the share button.
There will be a fifth game though, as of next week. Nintendo has announced by way of the official Mario Odyssey Twitter account that Odyssey will have capture capabilities at launch -- which, along with Zelda, will probably be one of the best uses you could ask for.
I wish video sharing was in at launch though, as we'd probably have so many more entertaining Breath of the Wild gifs to laugh at.
Mario Odyssey [Twitter] Thanks Ken!
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