Displacement in pixels

Good night, I would like to know if someone knows how to be more responsive in the displacements of x and y, since I have a higher resolution camera but the values of these axes remain the same and I do not obtain greater precision. I would like to capture displacements at the pixel level, but I do not know how to do it.
I'm waiting for any useful information.
Of course, thank you very much to everyone.
I'm waiting for any useful information.
Of course, thank you very much to everyone.