Police were called to a fast food restaurant on The Horsley Drive in Wetherill Park about 11.15pm to respond to reports of a fight between two groups of people who were allegedly armed with weapons.
The footage shows a group of people fighting in a car park, with one man allegedly beaten on the ground.
Officers found a man, believed to be aged in his 20s, with a wound on his leg.
He was treated by paramedics and taken to Liverpool Hospital in a stable condition for further treatment.
Police were told one group had allegedly fled the scene in a car prior to police arrival.
Three men, including two 18-year-olds and a 19-year-old, were arrested at the scene and taken to Fairfield Police Station.
The trio were charged with affray and granted conditional bail to appear at Fairfield Local Court on Thursday, December 18.