victoriavv

function findVideos() {
    let videos = document.querySelectorAll('.video');

    for (let i = 0; i < videos.length; i++) {
        setupVideo(videos[i]);
    }
}

function setupVideo(video) {
    let link = video.querySelector('.video__link');
    let media = video.querySelector('.video__media');
    let button = video.querySelector('.video__button');
    let id = link.dataset.id;
    video.addEventListener('click', () => {
        let iframe = createIframe(id);
        link.remove();
        button.remove();
        video.appendChild(iframe);
    });
    link.removeAttribute('href');
    video.classList.add('video--enabled');
}

function createIframe(id) {
    let iframe = document.createElement('iframe');
    iframe.setAttribute('allowfullscreen', '');
    iframe.setAttribute('allow', 'autoplay');
    iframe.setAttribute('src', generateURL(id));
    iframe.classList.add('video__media');
    return iframe;
}

function generateURL(id) {
    let query = '?rel=0&showinfo=0&autoplay=1';
    return 'https://www.youtube.com/embed/' + id + query;
}
findVideos();

Попробуйте этот скрипт, только надо еще добавить атрибут data-id с идентификатором видео в ссылку:

<div class="video">
        <a class="video__link" data-id="<? echo get_field('single-product-video'); ?>" href="https://youtu.be/<? echo get_field('single-product-video'); ?>">
            <img class="video__media" src="https://i.ytimg.com/vi/<? echo get_field('single-product-video'); ?>/maxresdefault.jpg" alt="<? the_title(); ?>">
        </a>
        <button class="video__button" aria-label="Запустить видео">
            <svg width="68" height="48" viewBox="0 0 68 48"><path class="video__button-shape" d="M66.52,7.74c-0.78-2.93-2.49-5.41-5.42-6.19C55.79,.13,34,0,34,0S12.21,.13,6.9,1.55 C3.97,2.33,2.27,4.81,1.48,7.74C0.06,13.05,0,24,0,24s0.06,10.95,1.48,16.26c0.78,2.93,2.49,5.41,5.42,6.19 C12.21,47.87,34,48,34,48s21.79-0.13,27.1-1.55c2.93-0.78,4.64-3.26,5.42-6.19C67.94,34.95,68,24,68,24S67.94,13.05,66.52,7.74z"></path><path class="video__button-icon" d="M 45,24 27,14 27,34"></path></svg>
        </button>
    </div>