The incident was captured on camera by Rhodes University employee Anelisa Donyeli, reported DispatchLIVE.
Police spokesperson Capt Mali Govender confirmed the incident happened on Sunday at Makhanda (formerly Grahamstown) and said a case of common assault had been opened.
In a video shared on social media, the bakkie driver can be seen holding a man while landing several upper-cut punches. The man is then thrown to the ground.
Two men in a Toyota Tazz, parked in front of the bakkie, climb out and attempt to intervene but the altercation continues until the bakkie driver accelerates and rams the Toyota out of his way.
No arrests were made immediately after the incident.
Gcaba is the son of the late Port Alfred and former Makhanda police cluster commander Col Vuyile Gcaba, reported DispatchLIVE.