In theory, there are technical means to remotely turn on the camera on another person's computer for monitoring without authorization, which is usually achieved through malicious software or hacking techniques. These methods include: 1. Trojan horses or other malicious software 2. Remote access tools are maliciously exploited 3. Exploitation of operating system or camera driver vulnerabilities 4. Vulnerability attack on webcam However, it is worth noting that: -These behaviors are illegal in most countries and regions -Modern operating systems usually have security measures (such as camera indicators, permission requests) -Good security habits (keep the system updated, use anti-virus software, physically block the camera, etc.) can effectively prevent such intrusions. If you are worried about the safety of your equipment, you should take appropriate protective measures and use trusted security software. If you suspect that the device has been compromised, you should immediately disconnect from the network and seek professional IT security help.