getUserMedia.js

// Save the requirements Object in your console 
const requirements = {'video': true, 'audio': true}

// Call navigator.mediaDevices.getUserMedia() passing in that object, and your camera should turn on. 
navigator.mediaDevices.getUserMedia(requirements)
    .then(stream => {
        console.log('Yay, we’re streaming:', stream);
    })
    .catch(error => {
        console.error('Whoops, could not access devices:', error);
    });