With exception to the introduction which uses video evidence to set the stage for what they will talk about. Most of the video is framing the historical context with legal precedent (which would be better done with text imho) although they do use archival footage to exemplify the time periods being talked about. Watching the KKK march down the street is different than reading about it.
However, an important part of the video, the "We Are Not Powerless" chapter uses video examples and talks about them directly. This is similar to how one can use quotes in text but it's a lot easier to do this in video when you are talking about a chaotic recording of a crime which has many small details in it. The speaker also talks about the importance of actually seeing what is happening and to not look away.
Personally, I think it's a very well done and important video dispite the YouTube shilling and self promotion (which I auto skip with SponsorBlock) and worth a watch.
However, if you don't have time to watch a ~30 min video. I'll help you skip to the end.
TLDR: If the 5 words "of The United States or ..." were added to the text of Section 1983, then people could sue "federal agents" for violations of their freedoms protected by the Constitution and it's amendments.
PS, I think media literacy is more than just being able to read and understand text. Firstly, there are people with disabilities like dyslexia. Secondly, when you watch a movie like Casino (1985) and misinterpret it, you might end up like Stephen Miller.