A method of precise measurements of coordinates and velocities of moving objects based on high-speed digital photography data analysis is observed. We investigate forced oscillations of pendulum and system of two coupled pendula. Parameter of models, which were used to describe these systems, where identified using computer processing of experimental data. Discovered difference of model and experiment led to more accurate definition of original model (transition from viscous damping to turbulent damping). Described method is a high-informative approach for mechanical motions analysis and identification of mechanical systems.