According to Digital Marketing Glossary,
Video marketing can be defined in digital marketing context as all uses of video contents to promote a brand, product or service. Videos are also used for showing and promoting products and services on commercial websites. For some products or services it can help transformation.
Videos can be used for advertising purposes by buying ad spaces (in-stream video, in-banner video, etc.) or by simply posting a video on a video platform (e.g., YouTube) and looking for viral dissemination.
Lisa D. Jenkins has compiled a great Essential Guide to Video Marketing – a resource for marketers that contains:
I also found these 2 articles that I found useful: