from watching the promo it looks like most of if not all the talent were filmed in front of green screen. To achieve that blocky look, one way would be to create a fractal noise layer, with the fractal type set to max and noise type set to block. set the scale to your desired size. colorize it accordingly.
now with the fractal layer selected, track “alpha” matte the keyed footage layer.you could also duplicate the keyed footage and blend it on top of the already TrkMat’d layer to give more detail and depth. this is a pretty basic way of achieving this effect in under 5 mins. you could play around with trapcode form and see what you can achieve.
hope this helps.