The Civilian Office of Police Accountability shared the video Friday, but the shooting occurred on July 8.
Police said two people in the street in Chicago's Belmont-Cragin neighborhood told an off-duty officer they had been kidnapped in Elgin and brought to Chicago.
An officer called for backup and entered the suspected kidnapper's building.
A spokesperson for the oversight agency said an investigation into the shooting is ongoing.
COPA must release video relevant to any investigation within 60 days of the incident.