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:

• Go Live with Streaming Video
• Hangout on Hybrid Video
• Video Marketing using Twitter, Instagram, Facebook, YouTube and Vine!
• Promoting your Videos and Video Channels
• Exploring Video Tools and Apps

Hubspot has published a Slideshare presentation on “How to use Online Videos for Marketing?“:

[slideshare id=1557896&doc=onlinevideomarketingwebinarjune2009slideshare-090609234228-phpapp02]

I also found these 2 articles that I found useful:

• How to Get Started With Video Marketing?

• 13 Interesting Ways to Use Video in Your Marketing

Syndacast created an infographics about the video marketing trends in 2015: