Use Featured Image as Header Background Image in Woo Canvas

My server got hacked and most of my sites were wiped yesterday. I’m currently trying to get multiple sites back up as quickly possible. One of these sites uses the Woo Canvas theme. When I first set it up I used a function and hook to use the featured image as the header background image for my pages. For the life of me I can’t remember the function. Hoping that someone may have also done this or knows what needs done. With multiple sites needing to go back up I could use a hand with this problem.