The world's biggest iPhone factory in the Chinese city of Zhengzhou has been the site of protests.
The videos show hundreds of workers marching with some being confronted by people in hazmat suits.
Some workers broke out when the company locked down the campus last month.
New workers were promised generous bonuses.
Workers shouted "Defend our rights!" in the video. We need to defend our rights. The workers smashed the cameras and windows with sticks.
Workers said they had not received bonuses as promised, and that they had not received food.
The worker at the Zhengzhou plant said that the contract they were promised had been changed.
He said that some new hires were worried about getting Covid from staff who had been there during the earlier outbreak.
The staff member said that those who are protesting want to get a subsidy and go back to their homes.
He said there was a heavy police deployment to the plant.
The company has yet to comment. The Zhengzhou plant assembles more phones than any other plant in the world.
Many workers fled the plant in October due to rising Covid cases and allegations of poor treatment of staff, their escape was captured on social media as they rode back to their hometowns.
Workers were offered higher salaries and bonuses in order to stay with the company.
The firm instituted closed loop operations at the plant to keep it out of the larger city of Zhengzhou because of a Covid outbreak there.
The disruption to production in Zhengzhou has led to lower shipments of the iPhone 14.