Automatically embed youtube videos in google search video results. Click "Raw" to install if you have tampermonkey

autoyoutubeembed.user.js

// ==UserScript==
// @name         Google Search Youtube Video Embedder
// @namespace    http://tampermonkey.net/
// @version      0.7
// @description  Automatically embed youtube videos in google search results
// @author       github.com/meshiest
// @match        https://www.google.com/search*
// @updateurl    https://gist.github.com/Meshiest/f104af2c0e4b6e589d33cca6a339c398/raw/autoyoutubeembed.user.js
// @grant        none
// ==/UserScript==

window.onload = event => {
    'use strict';

    // find the cite elem
    const citeElem = document.querySelector('cite');

    // make sure it's a youtube citation
    if (!citeElem || citeElem.innerText !== 'www.youtube.com › watch' && citeElem.innerText !== 'm.youtube.com › watch') {
        return;
    }

    // get the youtube link
    const link = citeElem.parentNode.previousSibling.querySelector('a');

    // make sure it exists
    if (!link) return;

    // now get the original preview container (image and link)
    const previewElem = citeElem.parentNode.parentNode.previousSibling;

    // get the dimensions
    const { width, height } = previewElem.getBoundingClientRect();

    // remove the preview element children
    previewElem.childNodes.forEach(e => e.remove());

    // embed the iframe
    const iframe = document.createElement('iframe');
    Object.entries({
        width, height,
        src: link.href.replace('m.youtube', 'www.youtube').replace(/watch\?.*v=/, 'embed/'),
        frameborder: '0',
        allow: 'autoplay; encrypted-media',
        allowfullscreen: true,
    }).forEach(([key, value]) => iframe.setAttribute(key, value));

    // put it in the preview
    previewElem.appendChild(iframe);
};