Police released the 30-second clip without sound Sunday, a day after 37-year-old Harith Augustus was killed in a shooting that set off violent protests.
It was not fully clear why officers initially approached Mr Augustus.
As Augustus tries to flee the scene, an officer is shown opening fire on him.
"The footage pauses and zooms in on the weapon".
Augustus then runs away and into the street as a police SUV drives up. He spins and darts between the SUV and the police cruiser as he reaches toward his waist.
The shooting happened after officers patrolling on foot tried to question the man over a "bulge around his waistband" that suggested he was armed, patrol chief Fred Waller told reporters.
He had no details of the confrontation but said the man suffered several gunshot wounds and was pronounced dead at Jackson Park Hospital.
"If we expect neighborhoods to cooperate with police, we need to do our part to remain transparent", Johnson said.
Johnson says the gun was a semiautomatic handgun but that he's not sure what caliber.
2 people injured in apparent shark attacks at same Florida beach
Beach officials closed the Nassau County beach Friday after Theobald and a 17 year old boy were bitten around the same time. Double red flags were flying on the beach, which was closed to the public for the rest of the day as a precaution.
The release of the body camera footage comes after heated protests on Saturday.
Footage taken by an officer at the scene and released by police Sunday sheds new light on the shooting, though lacks additional context.
The Chicago Sun-Times says scuffles broke out between protesters and police officers holding batons who had cordoned off the area.
The decision to make video public less than 24 hours after the incident was a notable departure from police department policy of officer-involved shootings. Some witnesses dispute the account, one of whom describes a police officer who "jumped out of her vehicle and had a gun", stopping the man as he was crossing the street.
"They thought he appeared to be reaching for a weapon, which he did have a weapon on him, and the officers tragically shot him", he told AP.
Dozens of protesters took the streets Saturday, with some demonstrators blasting the police "murderers" and a few slinging bottles and rocks at the officers.
In the protest, officials said three or four officers suffered minor injuries, and one patrol auto was damaged. The statement also said there will be a use of force investigation. This is the latest event to expose the mistrust between police and local residents in black communities in Chicago.
Chicago Police Department spokesman Anthony Guglielmi discounted those reports, saying that the officer who shot Augustus was a man.