Its not a video, but a picture of the setup I tried in Australia at QLD Arborcamp.
Going up -Krab on the ring of the bridge - grigri - right hand ascender with a pulley to help tail the grigri - foot loop off the ascender. There is also a sling from the ascender to a krab on the bridge, I think that was a safety backup.
Coming down, take off the hand ascender and foot loop and rappell down on the grigri.
Went 120' up a eucalyptus, got to the top and the guy up there said,
'let me undo the rope and set it a bit higher...'
I said, 'what...the ONE rope I am attached to?'
He said, 'yeah, no worries'
I said 'not for YOU buddy but what about me?'
I was way outside my comfort zone, but hey, it was a lot of fun once I relaxed and trusted the gear. It was very sphincterish being up that high with just a lanyard around a branch while a guy unties your SRT and resets it then that's what you have to rappell down on...I asked him if he could tie knots real well...turns out he was like the TOP climbing instructor in Queensland, a bit embarassing, but hey, means he knew how to tie that knot!