Using Web AR augmented reality on site

Site URL: https://www.superscientists.org

I'm interested in adding some web based augmented reality to my web page. It would be quite simple, just playing videos, not any 3D models, but I would like to use my existing squarespace site to do this.  I've found a company that can write the AR.js that is needed. Do I just add this to code in my page?  Any advice on using AR and squarespace would be greatly appreciated.   

Thanks!