tantive

This plugin allows background images to be set for all blocks. 
You can set CSS background-image, background-repeat, background-attachment, background-position-x, background-position-y, and background-size.

Tantive Set Background

Example block scaffolded with Create Block tool.

WordPress.org

Nick Halsey

This plugin is a WordPress core feature-plugin that adds cropping to background images for parity with header images. For this particular feature the implementation is quite simple, but it’s starting out as a plugin to gauge user interest in this feature and whether the feature improves the user experience of background images.
This plugin requires WordPress 4.3 Beta 3 or later.
If you’re interested in contributing to this project, ping @celloexpressions on <a href="https://chat.wordpress.org/" rel="nofollow ugc">WordPress core Slack</a>. Please comment on the trac ticket with ideas and feedback: https://core.trac.wordpress.org/ticket/32403.

Background Image Cropper

Easy too use and i hope to see this plugin have an editor image while cropping images.
Thanks

Hope to see more option with editor

This plugin is a WordPress core feature-plugin that adds cropping to background images for parity with header images. For this particular feature the  …

Tantive Set Background vs Background Image Cropper