Non-nitro users can stream in 1080p60, all they have to do is join a "boosted" server.
Which is very easy to do - you can find tons of freely joinable 'official' servers for games, which are boosted, and then join one of the available voice channels.
Which is very easy to do - you can find tons of freely joinable 'official' servers for games, which are boosted, and then join one of the available voice channels.