JSFiddle - React, Tailwind, and code Playground

HTML

<img alt="Vimeo" class="vimeo-thumb vimeo43430508" data-vimeoid="43430508" src="foo.gif">

CSS

.vimeo-thumb {
    background: #fff;
}

JavaScript

$(".vimeo-thumb").each(function(){        
        var id = $(this).data('vimeoid');
        $.getJSON('http://www.vimeo.com/api/v2/video/' + id + '.json?callback=?', {format: "json"}, function(data) {
            $('.vimeo' + id).css('background-image', 'url("' + data[0].thumbnail_medium + '")');
        });        
    });