NewNetflixZoom.js

// ==UserScript==
// @name         NewNetflixZoom2
// @namespace    amazon.tld
// @version      0.1
// @description  try to take over the world! ??? Profit.
// @author       Anonymouse
// @include      https://www.netflix.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    var newVersion = true;
    var findVideoElement = function() {
        return document.querySelectorAll('video')[0];
    };

    var zoomVideo = function(offset) {
        var ele = findVideoElement();
        var newPercent;
        if (ele.style.height.endsWith('px')) {
            newPercent = 100;
        } else {
            newPercent = parseInt(ele.style.height) + offset;
        }

        if (isNaN(newPercent)) newPercent = 100;
        console.log(newPercent);
        if (newPercent < 100) newPercent=100;
        ele.style.position = 'absolute';
        ele.style.height = newPercent + '%';
        ele.style.width = '100%';
        if (!newVersion) {
            ele.style.top = (-((newPercent - 100) / 2)) + '%';
        }
        console.log(ele.style.height);
    };

    document.onkeydown = function(evt) {
        if (evt.keyCode == 187) { // "=" zoomin
            zoomVideo(1);
        }
        if (evt.keyCode == 189) { // "-" zoomout
            zoomVideo(-1);
        }
    };

    console.log('Netflix Zoom loaded.');
})();