The five persons allegedly assaulted the three, including a woman, after their bike brushed aside the leg of one of the bystanders, DCP (East) Ajay Hilory said.
"We have detained five drunken people after we filed a suo motto case," he told PTI.
The video, which surfaced today, showed five reportedly drunken people beating up three-bike borne people, Hilory said.
The police have started interrogating the accused, he said.
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"We are investigating the exact day of the incident," he added.
The familiar spots of New Year's revelry in the downtown region in the country's IT capital were brought under a thick security blanket this year with the deployment of over 15,000 security personnel who were aided by drones and closed-circuit television cameras.
The security was tight to prevent a repeat of alleged incidents of groping and molestation of several women during New Year eve celebrations last year.
New Year revelry last year had turned into a nightmare for several women who were allegedly molested despite huge police presence at a large gathering in citys downtown region, drawing widespread national outrage.
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