Christopher Vourlias Artists and filmmakers Anna Fitch (“Survivors”) and Banker White (“Sierra Leone’s Refugee All-Stars”) are preparing a multidisciplinary documentary project that they’re pitching this week at the Hot Docs Forum, describing it as a testament to the enduring power of friendship and what we learn from each other in life and after death.“Heaven Through the Backdoor” explores the mystery of death through the unconventional friendship of Fitch and Yolanda Shea – affectionately dubbed “Yo” – two kindred spirits born 49 years apart. Directed by Fitch and White, the film is produced by Heidi Fleisher (“Wake Up on Mars”) and Sara Dosa (“Fire of Love”) for Mirabel Pictures.