Just activate the Parallax Background plugin or embed the code into your WordPress theme and parallax background images will become available for Visual Composer rows.
When you click on the
edit button on your rows, you will see these new parameters added (the last two: Enable Background Image Parallax and Parallax Speed):
Just add a large background image to your row using the normal method, then check the Enable Background Image Parallax and you’re good to go.
The code can also be embedded into your project. All you have to do is copy the files, then include the script in your code and it’ll work without any hassle. Instructions are included in the download package.