Tools like these can sort content thematically and provide analysis of the structure of digital media objects in such a way that the appearance of a summary is possible. While it has - seriously! - been credibly suggested that shorter texts (say, under 10,000 words) can now be MORE reliably summarized by AI than by humans, this is done in ways you may not expect, and fidelity can be very hard to judge. There is also a wide degree of variation in both the media inputs and outputs as well as the basic functionality of these tools, but they can be applied to text, audio and audio-visual materials.
Keep in mind that most of these tools work analytically, by breaking the whole to be summarized into sections and then re-summarizing the whole. Always check the product for elision, because the devil's in the deets.