Is it illegal for the property to give surveillance video to her boyfriend privately?

Illegal. According to the query of the Civil Code, it can be seen that the monitoring of property leakage infringes on the privacy of others and constitutes an illegal act of infringing on privacy. Therefore, it is illegal for the property to record surveillance videos for her boyfriend privately. Surveillance video refers to the real-time recording and monitoring of video data in a specific place with a camera.