Qaushiq Mukherjee, better known as Q, is a filmmaker whose work spans features and documentaries. Q first shot to the spotlight with Gandu (2010), and has consistently broken norms related to sexuality on the big screen. He spoke to Siddhartha Mishra about the camera as ‘voyeuristic’ device, his experiences in front of it and behind, and also about the politics of the image. Excerpts: