The alleged incident happened outside the office of the Superintendent of Police, North Goa, in the afternoon.
The video shows the policeman, a head-constable, who was apparently drunk, questioning the presence of Ashley Noronha, who works for an NGO, outside the SP office.
Noronha, who shot the video, alleged that the policeman abused him verbally in the presence of other police officers who remained mute spectators.
Goa Director General of Police Muktesh Chandar said inquiry has been ordered, and "strict departmental action would be taken against the policeman if found guilty".
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)