"My friends and I were assaulted by this homophobic man in downtown Salt Lake City last night," Trejo wrote. "Anyone know him? The police are interested in having a chat with him."
Sgt. Brandon Shearer with the Salt Lake City Police Department said they are investigating the alleged assault as a hate crime and anyone with information is asked to call 801-799-3000.
Monday, SLC Police stated they have made contact with the man "who is cooperating fully with the investigation."
Police have not released the man's name or any further details.
Trejo said that he and his friends were at a bar called "Rest", and when they stepped outside to wait for an Uber, the man in the video approached them and began to make remarks on what Trejo and his friends were wearing.
He also made misogynistic comments about girls who were part of the group, Trejo said.
Trejo stated that he began filming because he was scared for the group's safety. Soon after, the man asked if Trejo was gay. When he replied that he was, Trejo said the man threw a punch.
Trejo said the man was aiming for his chest but ended up striking him on the arm. His injuries were not severe.
Mayor Jackie Biskupski took to Twitter Sunday to condemn the attack and said police are looking into the incident.