1. A method for managing inventory, comprising: receiving, by a processor, a depth image captured by a depth sensing device; determining, by the processor, pixels that are in a region of interest of the depth image; determining, by the processor, that a number of pixels of the pixels that are in the region of interest containing motion is below a threshold; monitoring, by a processor, the region of interest to determine an inventory level based upon the depth image when the number of pixels containing motion in the region of interest is below the threshold; calculating, by the processor, a change in a depth in the region of interest from the depth image that is captured; and determining, by the processor, a change in the inventory level associated with the change in the depth of the region of interest.