If we're thinking of the same angle, is it from this channel? https://www.youtube.com/channel/UCbTLJi8lXWIt_d1AtRv4Nmw

Looks like it's not streaming live any more, but there are a few short recordings of that livestream on it.

As for the location: https://www.google.com/maps/place//@35.6621727,139.7579444,1...

Many years ago I stumbled across a webcam from an outdoor go cart track somewhere in Japan, and I was watching it a little bit. It was an internet connected webcam, rather than YouTube or anything like that. I still think about that place sometimes but I have no idea where in Japan it was, and no clear details about it to find it again.