Unfortunately, we cannot verify the authenticity of the alleged videos from China as there is very little evidence to corroborate the claim.
BBC reported that many residents from the Central Chinese city of Xi'an were evacuated just after midnight and forcibly taken to quarantine centers. The report further noted that several of those in quarantine camps posted images of the camps with very few facilities. Some of them even complained of food shortage.
The Daily Mail citing insiders from China, first reported incidents of residents in COVID-19 infected areas being forced into tiny, cramped metal boxes with basic facilities for a person to survive. Some videos shared online, along with images believed to be from the quarantine camps was, also shared in the Daily Mail report. The footage of people confined in tiny box-type houses is reportedly from Xi'an camp, where the local government enforced strict lockdown recently.
Politico, in its report, noted that millions of people in China's Tianjin, Xi'an, and Yuzhou are confined to their homes. Tianjin is a city very close to Beijing, which is set to host the Winter Olympics in February 2022. There were other reports of people complaining of a lack of proper medical supplies and food. In some places, people were escorted into quarantine camps using buses.
While almost all reports suggest that extreme measures have been implemented in Chinese cities to curb the spread of COVID-19 with the Winter Olympics weeks away, we could not verify the authenticity of the videos of people being forced into metallic quarantine facilities. A proper time frame is not available as to when or where these videos were shot. Thus, at the time of writing, we cannot verify the authenticity of the videos where people are allegedly forced into tiny metal boxes for quarantine in Chinese cities.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19, including symptoms, prevention, and available treatment, please refer to the World Health Organization or your national healthcare authority.