The video shows a customer pick up a wet floor sign and smash it over a worker's head.
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The incident happened around 2 a.m. on Sunday at a deli on Canal Street in Lower Manhattan.
The victim suffered swelling on his head and hand.
Police are trying to identify the attacker who got away in a black BMW.
Call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
You can also submit tips by visiting the CrimeStoppers website at crimestoppers.nypdonline.org or by messaging on Twitter @NYPDTips.
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