Brazilian taxpayers forked out some $11.5 billion for the 2014 World Cup but its legacy has proven negative, according to two new films. “Brazil vs. Brazil” and “The March of the White Elephants” showthe dark underbelly of the mega-event, which saw thousands of poor people removed from their homes and billions poured into state-of-the-art stadiums, some of which are now being used as parking lotsor wedding venues. The critical documentaries are screening at the Rio Film Festival.