The boy is in Grade 10 at Beacon Hill High school.
The boys, aged between 15 and 18, were standing on the corner of Fidelio Street in Eastridge when a police van stopped next to them.
The parents who are business people say they installed the camera a few years ago.
Their son was left with bruises and open wounds to his leg and chest.
The video shows the boys being confronted by the police on Wednesday at 12.10pm.
The cops begin searching the teens and one official starts kicking their son.
He is then dragged to the cop van and later gets out, limping.
The boy’s 36-year-old mother says she believes her son was attacked because he told cops he would be making a case against them.
“As the police kicked him and dragged him he said he is only 15 years old. He said he isn’t a gangster and isn’t on drugs and doesn’t even have an identity book. He said what they were doing was wrong and that he was going to make a case against them,” the mom says.
“They have a right to stand on the street, he is a quiet child and plays soccer with children younger than him.”
She says they reported the mater to the Mitchells Plain police station.
“My son is writing exams and when I showed the police the video and the pictures of his injuries, they immediately allowed me to open a case against the police.”
The 58-year-old grandmother of one of the other boys, who is 17 and in matric at Westridge High School, says they have also contacted Community Safety MEC Dan Plato.
“The MEC has been informed because police must focus on doing these type of things on the gangsters and merchants, these are just children,” the angry ouma said.
Plato says he encouraged the families to open cases and that he would be reporting the matter to the Ombudsman as well.
Constable Wesley Twigg confirms: “This office can confirm a case of assault common was opened for investigation by IPID (Independent Police Investigative Directorate).”