Security researchers analyzed the security flaws present in IoT devices used in smart buildings. They found over 4.6 million devices reachable over the internet with RTSP (Real-Time Streaming Protocol) traffic. The researchers used two types of attacks (denial of service and footage replay) that led to rendering an arbitrary stream to the video surveillance system (VSS) The model and brand of the cameras products are irrelevant as long as they rely on insecure streaming protocols, which ensure transmission over the network.
Source: https://www.bleepingcomputer.com/news/security/researchers-hack-surveillance-systems-to-show-fake-video-feed/