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This paper presents a generic framework for on-line reconfiguration of a multi-camera active-vision system for time-varying-geometry object/subject action recognition. The proposed methodology utilizes customizable pipeline architecture to select optimal camera poses in real time. Subject visibility is optimized via a depth-limited search algorithm. All stages are developed with real-time operation as the central focus. A human action-sensing implementation example demonstrates viability. Controlled experiments, first with a human analogue and, subsequently, with a real human, illustrate the workings of the proposed framework. A tangible increase in action-recognition success rate over other strategies, particularly those with static cameras, is noteworthy. The proposed framework is also shown to operate in real-time. Further experiments examine the effect of scaling the number of obstacles and cameras, sensing-system mobility, and library actions on real-time performance.