Surveillance cameras only identify the protestors.
In a letter to the United Nations High Commissioner for Human Rights, the Center for Human Rights Defenders states that no effective action has been taken to uncover the perpetrators and the reasons behind the murder of Mahsa Amini during the law enforcement patrols and the popular protests. This is despite the fact that most areas of the cities are equipped with cameras, and participants in street protests and gatherings are easily identified and arrested.
They write that the people of Iran, by recalling such behavior in Afghanistan by the Taliban and the dissatisfaction of the leaders of the Islamic Republic government with the protests of young girls against compulsory hijab, believe that the ultimate goal of such events is to confine women and girls to the confines of their homes.