In her complaint, the woman said that she was raped by Nitish Patel many times from September 2012, they said.
The woman met the accused in July 2012 when he visited an office where she used to work then. They became friends and in September 2012 Nitish went to her house to meet her.
After talking for a while, he asked her to marry him.
The woman, a divorcee, refused but the accused kept insisting.
He then raped her when she was home alone, police said.
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Later, Nitish demanded Rs 1 lakh to purchase a flat. When she refused, he threatened to upload the video online, police said.
The victim then paid him Rs 50,000 by cheque.
Post this incident, the woman shifted to various places but the accused kept following her.
The victim, however, didn't pay the amount.
A case was registered against the accused with Old Faridabad police station under relevant sections of the IPC today.
Police have started investigating the case, investigating officer Inspector Krishna Devi said.