Step 1: Click on the “ellipsis” icon on the block section.
Step 2: Select the “settings” icon
Step 3: Click on “background”, and click on the “add video” icon under “video”
Step 4: To add an external link, select “add link”, paste the link and click on “add link” again.
Step 6: To use a custom video as your background video, select “Upload Media” and click on “upload from computer”. Once the upload is completed, click on “view”.
Step 5: To upload from the media library, select “open media library”. Click on “Videos”, choose any video of your choice and click on “done”.