Video campaigns can help advertisers optimize for:
views and engagements
conversions
impressions
clicks
Explanation:
Adding interactive elements can create opportunities for viewers to engage with your brand on a deeper level, beyond watching and enjoying your video ad. Making your video ads interactive can also help you tailor your ads to better achieve specific advertising goals, such as driving app installs, product purchases, or visits to your website.
Read more here: https://support.google.com/adwords/answer/150471