Zend certified PHP/Magento developer

How to convert image to sound for oscilloscope visualization

I want to convert recorded video with a person (like rickroll video) to several second clip in oscilloscope. I want to use for it simple headphones and translate video to stereo signal. At first, I don’t know how to simplify video, just cutting out the outlines of a person, and then, I don’t know how to convert set of dots and lines to coordinates and then to music.
The scheme of what i am asking