Here are two examples:
Ecology: A New Opium for the Masses (Youtube video - not entirely about multiculturalism but it's discussed at some length as part of a larger argument)
Part 1 of 10
<http://www.youtube.com/watch?v=PTDhC_Sl7iM>
...
Tolerance as an Ideological Category (PDF file)
<http://monroelab.net/docs/Zizek_Tolerance.pdf>
.d.