It looks like what they did to achieve this effect was:
Use a mask to crop the video down to a horizontal strip of 1-2 pixels
Apply a curves or contrast effect to fade out the dark parts and only show the bright sections
Apply a glow to give it that ominous look
With the video playing underneath it then looks as if the pixels are moving about. The movement itself depends on the video that you are using for this effect (e.g. whether the strips are moving outward or inward).