Tracking displacement of objects in a time-lapse

I currently have a time-lapse with hundreds of images (300+) of a sand that has coffee grounds on it. Throughout the series of images, the markers move in one direction and in fairly small amounts. The goal is to find the displacement of almost every particle with every iteration and save this data in an array or spreadsheet.

I attached 3 images of one experiment for reference.

Any advice on how to approach this would be helpful! I have looked up many programs but a lot of them are extensive and complicated. This sounds like a 'simple' task but it has been very challenging!