“Diego Maradona”, making its world premiere at the 2019 Cannes Film Festival, is the latest from director Asif Kapadia. Pure Nonfiction host Thom Powers interviewed Asif about that film along with his previous documentaries “Senna” (about Formula One race car driver Ayrton Senna) and the Oscar-winning “Amy” (about singer Amy Winehouse). Their conversation took place in March at the CPH:DOX festival in Copenhagen.