By Bonnie Stiernberg When filmmaker Antonio Campos first approached the French team behind the Peabody Award-winning documentary The Staircase — which follows novelist Michael Peterson after his wife Kathleen is found dead at the bottom of a staircase in their home in 2001 and he’s charged with her murder — he was granted access to their old footage, notes and even some unused video. But according to a new Vanity Fair report, director Jean-Xavier de Lestrade, producer Allyson Luchak and others associated with the original Staircase are upset with the creative liberties taken by the HBO Max ada…