For a while now we have been using sound to augment the analysis. Sound is particularly useful when analysing structural vibrations under operational conditions.
A software module "Sound" is available to for sound analysis along with video. Time, frequency and spectrogram graphs of the recorded sound are supported as well as interactive display of the matching motion responses recorded by the camera.
Have a look at the software modularity at https://www.motion-scope.com/tracker-software.