1. An integrated method for modeling object tracking handoff between cameras, comprising, at a computer system with one or more processors and memory: creating a representation of allowable movement of an object within a floor layout that includes one or more rooms and one or more halls, wherein the movement is monitored by a plurality of cameras, wherein: the representation is modeled as a set of states in a Hidden Markov Model (HMM) including a first state, a second state, and a third state; the first state corresponds to a first camera area that represents at least a portion of a field of view of a first camera in the floor layout; and the second state corresponds to a first blind subregion of the floor layout that is not in a field of view of any of the plurality of cameras; a third state that corresponds to a second blind subregion of the floor layout that is not in the field of view of any of the plurality of cameras, wherein the second blind subregion is different from the first blind subregion; and training the HMM using video of activity in the fields of view of the cameras, wherein training the HMM includes determining a respective transition probability corresponding to movement of an object between the first camera area the first blind subregion and the second blind sub-region.