Addie Morfoot ContributorDespite having never made a documentary, Todd Haynes didn’t hesitate when Universal Music Group’s David Blackman approached him in 2018 to make a nonfiction feature about the enormously influential rock band the Velvet Underground, which was initially mentored by Andy Warhol and launched the careers of Lou Reed, John Cale and Nico.The Oscar-nominated director — known for narrative features including “Far From Heaven” “Carol,” “Dark Waters” and the Bob Dylan meditation