Add video background on WordPress blog post without plugin

Add video background on WordPress blog post without plugin. Here, we use a cover block function to insert video in the back side of the post. More Helpful videos How to add video background in WordPress site? https://youtu.be/OvHKZkHyYBI How to show PDF preview in WordPress Post? https://youtu.be/klxiiGXvmYY #add_video_background_on_wordpress_blog_post