Documentary maker Ingrid Martens on her film Africa Shafted Under One Roof

South African documentary maker Ingrid Martens talks about her latest doc - Africa Shafted Under One Roof - which looks at the people who live in Johannesburg’s Ponte Building. It is a 54 floor building that contains inhabitants from almost every country in Africa and they talk to Martens through a series of conversations in the lifts, shot over two years.