Our Moodle theme Herald’s landing page has a video section where you can add a YouTube video to promote your site. You can add your video via the theme settings page by entering the YouTube video ID. By default YouTube will display suggested videos after the video finishes (as shown in the figure below).
If you don’t want your visitors to get distracted by those suggested external videos you might want to disable the suggestions. To do that you can simply add
?rel=0 right after your YouTube video ID as shown in the figure below.