How to set up Gnash and Epiphany for youtube?

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http://askubuntu.com – I like the browser Epiphany (now Web or something). I also hate Flash and I heard about Gnash, its free alternative. All I want to do is to set up Epiphany somehow to use Gnash on YouTube. I can't get that to work. I have installed browser-plugin-gnash, but it doesn't do anything. I have plug-ins enabled in Epiphany. All it does is just display black box instead of video (just as if no plugin was installed). (HowTos)