This is the jquery-background-slideshow plugin

It

• is mobile friendly, loads images only before shown,
• uses a fade transition for the images,
• works on all modern browsers and the internet explorer 11.

Creates a slideshow in a div or fixed fullscreen as body background.

Usage:

$("body").backgroundSlideshow({
    delay: 10000, // delay between images in seconds, defaults to 5000
    transitionDuration: 3000,
    fixed: true, // display the background fullscreen and fixed
    onBeforeTransition: callbackBeforeShowingAnImage, // optional
    onAfterTransition: callbackAfterShowingAnImage, // optional
    images: ["image1.jpg", "image2.jpg", "image3.jpg"]
})

GitHub repository