Add blank cations in Video Element HTML

First create a Blank “captions_en.vtt” file and add text “WEBVTT” in the file
than add the file url in below script

jQuery(document).ready(function($) {
    $('video').each(function() {
        var track = $('<track>', {
            kind: 'captions',
            label: 'English', 
            src: '/wp-content/uploads/2024/10/captions_en.vtt', 
            srclang: 'en', 
            default: true 
        });
        $(this).append(track);
    });
});