Google’s internal algorithm for search engine results is optimized for quality of content and the relevance to the original search terms someone puts in.  Video plays a big role in both of these elements. 

Google doesn’t just look at the text on the page, but particularly it scans for other types of media to see precisely what you are offering. Sites that have a mixture of text and quality videos and visuals will be identified as varied as they are informative, and your SEO efforts will be given an added boost for this.