I have followed the step by step guide and moved the Video popup particle to another Gantry 5 template I was using. It works perfectly.
Nice to see Gantry 5 being so straight forward to use. I have one site on an old Gantry but I wouldnt dare try and toy with updating from 4 to 5!
My question now is on the Video popup particle. I know the source looks at your files in a folder. Is there any way of linking the popup to an external area such as youtube, vimeo etc?