A bittersweet fresco of glamor, fame, and sexual variance, James Rasin’s video documentary chronicles the short life of Andy Warhol’s most beautiful drag “superstar”: James Slattery, aka Candy Darling, a Kim Novak devotee who starred in Warhol and Paul Morrissey’s Women in Revolt and was a subject of Lou Reed’s “Walk on the Wild Side.” Drawing on a treasure trove of films, photos, and memorabilia kept by Darling’s longtime admirer Jeremiah Newton, Rasin shows us the dark and light sides of drag life, and of the bizarre Manhattan demimonde through which Darling traced an ultimately tragic arc. Chloe Sevigny reads from the subject’s diaries.