1. A method for multi-mode video event indexing, the method comprising: applying background subtraction to images from a video stream input to detect foreground object activity as a difference between current frame image information and static information of a contextual background of video input images from the video stream input; determining whether a camera providing the video stream input of images is moving or is stationary, relative to a scene within the video stream input images; in response to determining that the camera is stationary relative to the scene within the video stream input images, selecting an object tracking based analytic mode from a plurality of video analytics modes and applying the object tracking based analytic mode to the detected foreground object activity of the video input images to track a foreground object within the video input images; and in response to determining that the camera is moving relative to the scene within the video stream input images, selecting a non-object tracking based analytic mode from the plurality of video analytics modes and applying the non-object tracking based analytic mode to the detected foreground object activity of the video input images to determine object movement activity within the video input images from extracted foreground object appearance attributes without tracking the foreground object; and wherein the non-object tracking based analytic mode is different from the object tracking based analytic mode.