There is a popular saying in adland - the only thing that works in a video is the skip button.
Today, a marketer has access to many kinds of videos – Facebook Live, YouTube, Vine, Instagram Stories, even TVCs. The key question is: how much of an ad really makes a difference? Are the 3 seconds before the "Skip ad" even viewed? And if they are, does it grab the user attention afterwards? Once the ad is completed, does it lead the user to other actions like "buy now" or "know more" or "avail a voucher".