For anyone using Thinkster.io that wants to be able to pause the video with the spacebar, paste this snippet in your Dev Tools console.

thinksterSpacebarVideoControl.js

let videoHolder, videoPlayer, videoPlayerContainer, videoOverlay, videoPresent = true;

let setVariables = function() {
	try {
		videoHolder = document.querySelector('.video-holder');
		videoPlayer = videoHolder.querySelector('video');
		videoPlayerContainer = videoPlayer.parentElement;
		videoOverlay = videoHolder.querySelector('.video-js.vjs-big-play-centered');
	} catch(err){
		console.log('no video on this page');
		videoPresent = false;
	}
};

// doesn't need to worry about on load right now, 
// because someone pastes this into console (for now)
setVariables();

let isPlaying = function() { return (videoPlayerContainer.classList.contains('vjs-playing')); };

let togglePlay = function () {
	if (isPlaying()) { videoPlayer.pause(); }
	else { videoPlayer.play(); }
};

let getId = function(el){ return el.getAttribute('data-react-checksum');}

document.addEventListener("keydown", event => {
	if ((event.isComposing || event.keyCode === 32) && videoPresent) {
		// //stop window from scrolling down
		event.preventDefault();
		// check if video has changed
		if (getId(videoHolder) != getId(document.querySelector('.video-holder'))) setVariables();

		//if the video hasn't been started at all, trigger that
		if (videoOverlay && videoOverlay.style.display != "none") videoOverlay.click();
		// otherwise, use player controls
		else if (videoHolder) togglePlay();
	}
});