loop="true" is depreciated to the best of my knowledge. The HTML5 video tag is much more versatile with modern browsers. Something like:
<video width="100%" height="100%" autoplay loop>
<source src="http://www.quenchdigital.co.uk/video/cliftonville-tour.mp4" type="video/mp4" />
Your browser does not support the video tag.
</video>
If you share some more details about what you’re trying to achieve, along with your public link, we can get a bit more specific regarding integration into your project. 