Hi,
You need a really new browser for this video (Iceweasel/Firefox 17 does not work, Chromium 28 does work).
http://www.irill.org/videos/debconf13/X2Go_Terminal_Server_Suite_and_Debian....
In my opinion it's a very good idea to use a driver in Xorg to avoid the license problems.
With regards, Paul van der Vlis
-- Paul van der Vlis Linux systeembeheer, Groningen http://www.vandervlis.nl