According to one South African news source, the vidoe was actually leaked on of the four's girlfriend after he broke up with her.
Having watched the video I don't agree that it is racist. In bad taste, unintelligent and a waste of time yes.
While watching the video I was struck by a number of inconsistencies when compared to what was being reported via the media.
For example, not one of the cleaners in the video seem to really protest. Based on the video alone, they do not appear to be forced and seem to be quite willing participants, smiling through most of it. No-on is holding a gun to their heads to stay there and there is nothing evident that prevents them from leaving at any time - yet they stay.
Regarding the urinating part of the video, one of the "perpetrators"claimed that they used a water bottle and made it look like he was urinating - a very plausible explanation. When viewing the video on my laptop and plugging my headphones into the SPDIF socket, you can clearly hear something like a squeeze bottle with a snap cap being closed when the one doing the "urinating" was told to stop.
Based on this simple analysis, I doubt that the video was racist in any way. Stupid, yes. In bad taste, definately. Crass, yes. Racist? No.
To view the video if you haven't seen it:
http://iafrica.com/news/sa/150035.htm