To watch the stream from VLC on your computer, run:
nix-shell --packages vlc --run "vlc https://dash.nixcon.net/dash/master.m3u8"
or (macOS users try this one):
nix-shell --packages mpv --run "mpv https://dash.nixcon.net/dash/master.m3u8"
The stream will be broadcast to YouTube as well, for devices where watching this version does not work.