Use HTML Module to create Parallax Banner, add the module to a layout and apply the layout to any category or Page / Homepage for a beautiful effect on scroll up/ down.

Step 1: Install HTML Module ( if not in default installation )
Step 2: Add new module in HTML Module. Go to Code View. Copy Paste the provided code and configure with your suitability. Save.
Step 3: Use anywhere, in an existing layout. Or create a new Layout and add it there and apply the layout to any category / Page.
Enjoy!