For me it's working. I have no idea if the website uses flash or not, or what codecs are required. With these commands, you can install third-party codecs and H.264:
sudo apt-get install ubuntu-restricted-extras
sudo apt-get install chromium-codecs-ffmpeg-extra
Try to restart Opera and see if it's working. If not, you may have to install flash. Then there are two alternatives, either:
sudo apt-get install pepperflashplugin-nonfree
(You may also have to run this command:)
sudo update-pepperflashplugin-nonfree --install
However, right now there are problems with the command above, so if you restart Opera and it still isn't working, try the second alternative instead:
1. Open software and updates
2. Click "other software"
3. Check "Canonical partners"
4. Click "Close", then "Reload" in the pop-up.
5. Then run this command: sudo apt-get install adobe-flashplugin
Then restart Opera.