The video showed the minister -- while talking to reporters at the event on child rights -- turn around and see the man, who was trying to click a selfie with him. Irked, Mr Shivakumar slapped the man on the arm in front of the cameras.
The minister later defended his action, saying it was a "normal incident".
"Have basic common sense. When I'm carrying out my responsibility and addressing the press, how can someone come out for a selfie? It was a normal incident," he said.
Mr Shivakumar, who handles the energy portfolio in the Siddaramaiah government, was raided by the Income Tax authorities in August. Sources had told NDTV that more than Rs 300 crore of "undisclosed income" was found during the raids.
Denying any wrongdoing, the minister had said, "I'm not the kind of person that violates the law and the Constitution... the truth will come out".
Questioning the timing of raids, his party, the Congress had accused the government of misusing Central agencies.
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