This is an onboarding tool I created for UBER drivers. An UBER driver's first ride can be a little nerve wracking (I know from personal experience). This tool walks the driver through a typical flow to prepare them for their first ride. It is more interactive than a video and will give them more confidence before hitting the road.
If you need to get the Y position of a vertically scrolling container, create a text box. Then on the container scroll trigger, set a variable that evaluates the numerical callback value from the event (Y position). Then add a callback that changes the text property of the text box by reading from the variable.