Maybe I'm a bit picky, but with Snowden and the latest databroker files (in Germany) in mind, I do not want to use YouTube / Google any more.
I know there are anonymizing Youtube proxys around, but google doesn't like them and sabotages them. ...

Is is possible that Gnome foundation / GUADEC uses an alternative streaming platform.

IIRC for example PeerTube also can handle live streams (with recording), too.