Does an Iphone 6s work for taking youtube videos?

In memory of Chester Benningham and Linkin Park I was going to make a couple tribute cover videos but I don't have a decent camera other than the one on my Iphone 6s (128g so it has space)

Will it work just for some vocals and maybe guitar/piano? Can I upload videos on my phone to youtube directly or do I have to have a computer as a median? (I have one but its a Chromebook)

Do anything you want, everyone is making a video about the guy.

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