The 47-minute video clip believed to be shot by one of the factory workers on a mobile phone shows the man, identified as Ram Singh, being thrashed mercilessly. Police are trying to find out who filmed it.
Ram, a native of Bihar, was accused of theft by the factory owner and taken away by his henchmen on Thursday. Ram's body was found the next day with injuries all over.
The video purportedly shows the factory owner Jaspreet Singh and two others take turns to beat the man, laughing and hurling abuses in Punjabi.
"They came for him at around 8 in the morning and took him away in a car. He thought they had come to take him to work," Ram's wife Rajji said.
Police have filed charges of murder against the factory owner and two others. All three are absconding.
"We will catch them soon," Narinder Kaur, the investigating officer, said.
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