Video submissions are extremely important for a business to explain its services to a larger audience. The more people know about your product and services and understand how they work, makes your job lot easier to promote it to a certain group of people. Video submission sites help share your content with a huge array of audience, that uses various channels to keep themselves informed. Additionally, these video submission sites due to the nature of video libraries get a lot of traffic by themselves. So they are an excellent platform to not only share your content but to get a high-quality backlink as well.
Additionally, in video submission sites you can upload videos along with the Keyword and Title of your choosing. Some even allow inserting links in the descriptions. This helps in making a certain keyword more popular for the selected URL. Not just for backlinks, if the video is informative and contains high-quality content, then the message in the video can become viral and make you an overnight sensation.