A cowardly punk sucker-punched a Brooklyn bodega worker during a scuffle with a rowdy mob outside the Midwood market Monday night — with the shocking attack caught on surveillance video .

Police are now looking for the thug who slugged the 36-year-old victim from behind and sent him to the hospital with serious head injuries after workers at the Avenue M store refused to let the troublesome crew inside around 6 p.m., the dramatic footage shows.

A group of about a half-dozen is seen approaching the store, with several going inside — until one of them is stopped at the door and appears to get into a dispute with someone inside, the clip posted online Monday night by NYC Viral News shows.

“Open this door,” the punk is heard saying. “You can tell me excuse me. You don’t have to tell me an

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