Parallax effect on image

Hi, I’m trying to make a website for a school assignment and I can’t seem to find a code that creates a parallax effect on an image. I want something similar to the link below. Does anyone have a vanilla code?

You could maybe google ‘parallax effect’.
Here’s a nice tut:

You could just fix the position of the image, like this: Navigation buttons

Add rest of the elements in above the image. That should do it.