Yes, there are technical means to remotely turn on the camera on a computer without authorization and monitor it in real time. This usually involves means such as malware, Trojans, or cyber attacks. These tools can infect the target computer, gain permissions and control the camera, but these actions are illegal and violate privacy rights and laws. Modern operating systems and security software usually take measures to prevent such actions, such as monitoring camera usage permissions and alerting users that the camera is turned on. Therefore, keeping your computer secure, using strong passwords, updating software regularly, and installing anti-virus software are effective ways to protect your personal privacy. If you find suspicious activity or potential infection, you should take immediate steps to remove and repair it.