In the video, the victim can be seen desperately trying to cover his face, as a man punches and kicks him during the brutal attack on Sunday in Broad Street, Birmingham. A crowd is gathered around the man, but no-one tries to help him, Birmingham Mail reported.
A spokesperson for West Midlands Police said: "We are aware of a video posted on the Internet which appears to show a man being assaulted on Broad Street in Birmingham on Sunday, March 29.
"We are currently making inquiries to establish exactly what has happened but at this stage, nobody has come forward to tell us they've been assaulted," the spokesperson said.
Police have asked the victim to come forward.
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"I would encourage the man who appears to be the victim in the video to contact us, along with anyone else who was there at the time and can give us any further details," the spokesperson said.
On the 'Daily Sikh Updates' Facebook site, one individual posted: "How many against one? No one there had the courage to step in. Shame on all the people that stood and watched.