The victim, who lodged a complaint of rape, released the clip to a TV channel alleging that a close aide of Nagar's brother offered her Rs 2 crore to drop the case.
The Police said the video has been sent to the Forensic Science Laboratory for examination. When contacted Nagar said, "We have no affiliation with the said person nor is any one from our family involved in it."
Nagar, minister of state for dairy and khadi, resigned on September 19 after he was accused of raping the woman at his residence here, triggering a political storm.
Nagar denied the charge claiming that his political adversaries had hatched a conspiracy to tarnish his image.