When Googlebot crawls a page, it should see the page the same way an average user does15. For optimal rendering and indexing, always allow Googlebot access to the JavaScript, CSS, and image files used by your website. If your site's robots.txt file disallows crawling of these assets, it directly harms how well our algorithms render and index your content. This can result in suboptimal rankings.
There are plenty of tactics you can use to ensure your videos get found easier in search engines. The first thing you should do to derive the maximum SEO value from your video (before you upload your video to any sharing sites) is to host it on your own domain. It’s also important to enable embedding on your video as this will help you increase the likelihood of receiving inbound marketing links. Oh and don’t forget to avail of video sitemaps – in this nifty document Google explains how to create a video sitemap with ease.