Sai Prasad

This plugin is a tiny Vanilla JS library that adds parallax animations on any images and it stands out for its ease and its visual rendering. The parallax effect is directly applied to image tags, there is no need to use background images. 
You can find demo after installing the plugin

Awesome Parallax Effects

it is unique

This plugin use to adds parallax animations on any images/videos. The prallax effect is directly applied to image or video tags and their containers a …

tommygeorge

Super Simple jQuery Parallax Background enables a parallax effect with your theme’s background image. Just set a background image in your theme’s “customize” options (optionally setting it to “fixed” position) and activate this plugin. Done. “It just works.”
It relies on jQuery, which comes with WordPress and is probably built into your theme. Tested and works with the “Twenty Twelve” theme out of the box.
Looks best with seamlessly-tiling background images.

Super Simple jQuery Parallax Background

For themes with background images, creates a parallax effect when scrolling. Super simple; no configuration. Just works.

Awesome Parallax Effects vs Super Simple jQuery Parallax Background