It’s incorrect to credit Cirque du Soleil for this unicycle.
Although neither do I know the name of the unicyclist.
In 2012 I made a better picture of another in Rotterdam:
I think if you’re truly seriously about learning this, you also could try and ask Semcycle.
Appearently everybody forgot that Sem has a direct driven one, however; he rides it for real (without the ease of slackwire).