I was annoyed by the fact that a lot of video players on the web don't offer an AirPlay button in Safari, so I built a browser extension to fix this. As I'm Dutch I haven't tried it on a lot of non-Dutch websites, but it should work on any website that serves html5 video. Sometimes it's required to disable Flash for a specific website in order to force it to serve video in the right format. Be sure you're running Safari on El Capitan.
http://airplayenabler.xyz
It's a first version, so let me know what you think
http://airplayenabler.xyz
It's a first version, so let me know what you think