Similarly, the division of functionality between a video source 222 and the server system 164 can vary in different implementations. For example, in some implementations, the client side module is a thin client that provides only user facing input and output processing functions, and delegates all other data processing functionality to a backend server e. g. , the server system 164. Similarly, in some implementations, a respective one of the video sources 222 is a simple video capturing device that continuously captures and streams video data to the server system 164 with limited or no local preliminary processing on the video data. Although many aspects of the present technology are described from the perspective of the server system 164, the corresponding actions performed by a client device 220 and/or the video sources 222 would be apparent to one of skill in the art. Similarly, some aspects of the present technology may be described from the perspective of a client device or a video source, and the corresponding actions performed by the video server would be apparent to one of skill in the art. Furthermore, some aspects of the present technology may be performed by the server system 164, a client device 220, and a video source 222 cooperatively. In some implementations, a video source 222 e. g. , a camera 118 or 106 transmits one or more streams of video data to the server system 164.