Sorry if I didn’t expressed myself clearly. I know you can switch on the footer parallax effect at theme setting. However, that only applies to the theme builtin footer. I am using the #contact section as the footer of my website and hopping to apply the same parallax effect on it. How do I do it?
For that you have to develop custom code.
Developing custom code for custom functionality is beyond the scope of support that we provide here. Please see https://themeforest.net/item/jevelin-multipurpose-premium-responsive-wordpress-theme/14728833/support
If you are not a developer then you can consider hiring a developer to develop it for you. You can hire a developer from any freelance site. Shufflehound recommends the developer https://www.upwork.com/freelancers/~011652ffec8865c6d