My opinion on this would be, people want there windows cleaned, watching a vid like groundhogs would put them off (I am not knocking the guy at all) but I said staright away that it looked like he was not cleaning it right (from my view point not a fact and he says they are fine and I tend to think hes being honest)
As for marketing on on a website it is very hard to see end result with wfp then there is the way you do it, do it too quick they will see and think it is not being done right and many more problems.
I dont think this is a great idea for marketing at all to get more custom, I am doubtful that I would put this type of thing on a site I own to get more work, to show other window cleans yes, new custom no.
Your idea for the harris pole was a good one in some peoples eyes I will try it as it is worth a try.
Pics can speak a thousand words because they dont move, vids move they show things and not always good
Ian