Who took the nithyananda scandal video? while he was with the actress

Who took the swami nithyananda scandal video? The identity of the person who taken the video of swamiji still remains undisclosed. The sun tv reports also states that they got the video disc which runs for a duration of 30 mins and not disclosed about the source of video clip. It was assumed that some hidden camera was fixed inside his room purposefully to reveal the hidden activities of nithyananda.