JSFiddle - React, Tailwind, and code Playground

JavaScript

var video = document.createElement('video');
video.setAttribute('crossorigin', 'anonymous');
video.src = 'https://dl.dropboxusercontent.com/s/tozkw68tccsp39a/BrianNalumonWindmill360p.mp4'

var audioContext = new AudioContext();

var source = audioContext.createMediaElementSource(video);
var sp = audioContext.createScriptProcessor(1024, 2, 2);
sp.onaudioprocess = function(e) { console.log(e.inputBuffer.getChannelData(0)); }
source.connect(sp);
sp.connect(audioContext.destination)

document.body.appendChild(video);
video.play();