In “Sergio,” Wagner Moura plays a UN diplomat named Sergio Vieira de Mello. The film is about the unfortunate events that took place on August 19, 2003, when the Canal Hotel in Baghdad, Iraq was bombed. The bombing led to the death of 22 people, including Sergio, who was the UN High Commissioner for Human Rights in Iraq at the time. Moura took the role very seriously and prepared intensively for the role. He spoke about how challenging it was to portray a real person, especially one as remarkable as Sergio Vieira de Mello.
Source: Gizmodo.Com