This video is from Knysna Hill Climb in South Africa. You can see what I assume to be the couple cars ahead of the silver GT-R are also GT-Rs so they have what appears to be a great field of streetcars for this hillclimb. Reports show that they get about 9000 spectators for the event and are looking at about 10-12K spectators in 2014. The event is surrounded by classic car shows and other events supported by the town and local community.
It was sponsored by Renault from '09 to '12 and when Renault pulled its sponsorship in '13 the event was cancelled. With the addition of Jaguar as a title sponsor for '14 the event will return this May. I'm assuming this video is from the '11 edition of the race since '13 was cancelled and '14 hasn't happened yet and with the second video ascribed to 2011 showing a wrecked silver GT-R in addition to the crash of an Audi R8. It does appear to be a very short hill climb however given that the winning times in '12 (top seven spots all held by GT-Rs) were in the 40+ second range. You can see a couple photos of the course at below.
You can see more info on the event here: http://www.speedfestival.co.za/