Zamal directed several documentaries, starting with the 2006 "Truth and Beyond", which explores Islam in Bangladesh. Later that year he made "Smritir Minar" ("A Monument of Memories"), which records Bangladeshi participation in the 2006 "Vijay Diwas" (Victory Day) ceremonies of the Eastern Command of the Indian Army in Kolkata. The event commemorates the end of the Indo-Pakistani War of 1971 and Bangladesh Liberation War. His 2011 "Pahela Baishakh" shows the Bengali New Year festivities.