Not much there, seems more like a promo for the YouTube video which is also not much... It's just an OpenCV Python script (~40 lines) that converts a grayscale image to a set of ASCII characters.
I remember watching the matrix with mplayer and libcaca a decade or 2 ago :)
I built something similar back when jQuery plugins were still a thing (oh my), but video seems broken in nowaday's browsers unfortunately: https://github.com/m90/jquery.abc
Here's an old one but good one: Text Mode Quake.
Unfortunately offline, so archived link: