To cite comments, adapt the recommendations for citing comments on blog posts or social media (see the Manual, 14.105 and 14.106).
Example 1 – YouTube Video
N: "The Book2Net Spirit book Scanner, in Your Library," posted by University of Lethbridge Library,
January 30, 2015, video, 1:56, https://www.youtube.com/watch?v=_G4uRvMb5jU&feature=youtu.be.
B: "The Book2Net Spirit book Scanner, in Your Library." Posted by University of Lethbridge Library,
January 30, 2015. Video, 1:56. https://www.youtube.com/watch?v=_G4uRvMb5jU&feature=youtu.be.
Example 2 – News Video
N: Dave Seglins, "CSE Monitors Canadian Emails to Government," CBC News, February 25, 2015,
video, 1:40, http://www.cbc.ca/news/canada/cse-monitors-millions-of-canadian-emails-to-government-1.2969687.
B: Seglins, Dave. "CSE Monitors Canadian Emails to Government." CBC News, February 25, 2015.
Video, 1:40. http://www.cbc.ca/news/canada/cse-monitors-millions-of-canadian-emails-to-government-1.2969687.