The Studio Press Infinity Pro theme includes a filter for customizing which front page images can have background images configured through the WordPress customizer. This snippet, when added to the theme’s /lib/helper-functions.php file, will allow you to add images to all of the front page widget areas.
https://gist.github.com/vfontjr/a53269245dd3fedb1252c0f8abd7789a#file-add-images-front-page-widget-areas-infinity-pro-phpIf you don’t want all widget areas to have background images, just remove the number from the array. The default is 1,3,5,7. One last step to finalize this, edit front-page.php and change the solid section class to image-section for any area to which you are adding an image.