Description:Olympic fever has well and truly swept across the globe, but not everyone is focused solely on London. Brazil's 2016 Games in Rio are four years away, and the organisers are hoping to learn from the good and bad London has to offer. One minor gripe has been the apparent empty seats at several of the early events, and Leonardo Gryner, the man tasked with making Rio 2016 happen, says this is not uncommon.(1:24)