Video-on-demand method and device for cross-level camera, server and medium

The invention discloses a video-on-demand method and device for a cross-level camera, a server and a medium. The method comprises the following steps: detecting a camera on-demand notification, and determining whether an on-demand camera is a camera of a current server based on the camera on-demand notification and a current server node identifier; when the camera is not the camera of the current server, sending a camera on-demand notification to a next-level server so as to execute a camera step of determining whether the on-demand camera is the current server based on the camera on-demand notification and the current server node identifier through the next-level server, until the target server to which the video-on-demand camera belongs is queried; receiving a video stream of the on-demand camera sent by the target server in response to the camera on-demand notification, and sending the video stream to the client sending the camera on-demand notification, so as to play the video stream through the client, t