Hi Amin,
Thank you for reaching out to us. Currently, you can create a slideshow of background images on any page by going to page settings in either Cornerstone to WP page editor:
The feature you’re looking for, could be possible with custom development, but this would be outside the scope of support we can offer. You may wish to consult a developer to assist you with this. You can also refer to the following thread: https://stackoverflow.com/questions/51462517/how-to-change-background-image-every-time-page-loads-in-wordpress
Thanks for understanding. Take care!