"Shoppers who viewed video were 174% more likely to purchase than viewers who did not."

188.7 million people in the US watched 46 billion online content videos in September 2013. The average American spent more than 20 hours watching online video.Comscore, 2013.

Professionally produced video optimized for eCommerce outperforms user-generated video (UGC video) by 30%, delivering a 24.7% lift as compared with an 18.7% lift for the UGC video. Comscore, 2012

Retail site visitors who view video stay two minutes longer on average and are 64% more likely to purchase than other site visitors.Comscore, 2010. 96% of online shoppers watch online video.
http://www.invodo.com/resources/statistics/