Does it do it all the time or just when leaning to the left? I remember reading about how something in the trans broke but was only noticeable when leaning left.
It sounds and looks like a dog is catching a tooth intermittently. This would require engine removal and splitting the cases to fix. Not something I personally would tackle. I'd probably buy another engine or send my current one to Rylan Vos at the Vic Shop for repair. Neither option is easy or cheap.
I could be wrong though so I would definitely get another opinion or more. I'd probably call Rylan after sending him that video link via email to get his opinion first.