The incident was reported on East 14th Street between Avenues I and J just before 6:30 a.m.
Authorities say the 91-year-old victim was approached by the suspect while he was sitting on a stoop and waiting for a ride to say his morning prayers at synagogue.
The suspect demanded money, and after giving him $4, the suspect started going through the victim's pockets and hit him in the head with a cane.
The victim was understandably shaken up but the video shows he tried to fight back with his own cane and was screaming.
The victim was taken to the hospital for cuts and bruising. He had his eye stitched up and his son says he is recovering and healing at home.
The suspect got away. No arrests have been made.
The victim is an immigrant from Iran and speaks little English. Neighbors say he is a sweet man who walks around blessing people.
They say he is frail, but he is often seen doing things on his own, like going to the grocery store.
The Flatbush Shomrim, a neighborhood safety patrol, is passing out fliers with a picture of the suspect and working with the NYPD to help catch the attacker.
They say they have a good idea of who the suspect is and he also has a tell-tale walk that is easy to recognize.
ALSO READ | 1st responders catch baby tossed from burning apartment complex in NJ
* More Brooklyn news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube
Submit a News Tip