The phrase "to accompany the video" means to go together or be along with the video. It refers to something, like music or narration, that is added or played alongside a video to enhance or provide more information. Full definition
The researchers have illustrated the structure in accompanying videos, which show the intact genome from one particular mouse embryonic stem cell. (sciencedaily.com)
In addition, there are three sharply produced digital videos with accompanying video stills. (dailyserving.com)
And the images and accompanying video of the actor is taking over the internet. (indianexpress.com)