Ideally, I would like to see how many times our visitors scrolling down from his/her visit.
I can't stop wondering how such questions may help business to grow?...
Maybe you wanted to understand how often the visitors scrolled the page(s) to a certain content block (in other words, viewed a promo or offer)?
I assume that you're tracking through Adobe Launch. In that case, look for the Time and Scroll extension.
If you can isolate the action or information, you can track it with Adobe Analytics.
For "scroll down" actions, I think you'll need some combination of the approach outlined in the Stack Overflow question found here and Launch's "Custom Code" event type:
That said, what question are you trying to answer? Is it truly just to know when someone "scrolls down"? Or, is there another purpose?