I think the real danger with using video is the risk of losing the potential customers attention because we haven't given enough thought to what is important for the viewer, instead, we tell them what we think is important , a nice shiny machine, a before and after, a carpet being vacuumed, but what if none of these things speak to their real concerns? Is the company reliable? Will they try and double the price with extra services once they get into my property. Will I be safe with a strange man in my house? Will my carpet look as clean as the one in the video, or was that just a set up?
I think still pictures work far better because you are showing them something they can readily recognise as what they are looking for from a carpet cleaner.
Simon