Hi Jane,
There isn't a video of West, in fact it isn't performed on stage all that often, so it is interesting you have chosen to study it.
In terms of the physicality the play shows many similarities with East, and there is a DVD of East directed by Berkoff, which is exceptionally good. Maybe this will help.
http://www.iainfisher.com/berkoff/berkoff-shop-filmed.htmlThere are some excerpts of West here but none directed by Berkoff
http://www.iainfisher.com/berkoff/berkoff-download.htmlIf you are close to London you can see Berkoff on stage performing in On The Waterfront. The ensemble show Berkoff's skill and imagination in conveying violence with subtle choreography. Berkoff is also doing a Q&A session- see the other post "Q&A with Berkoff". You could ask him yourself.
Does this help? Let us know how it goes, and further questions are welcome.
Iain
PS Why West, and what is your favourite part of the play?