It can help more than superficially, it can become a starting point for humans to go and refine classification into a controlled taxonomy. The Google implement

It can help more than superficially, it can become a starting point for humans to go and refine classification into a controlled taxonomy. The Google implementation can also detect when different people are speaking which is useful - though it takes someone to tag who is who. As I mentioned in another post, it can also highlight where things are happening in a video - for instance a 2hr video where a scene suddenly appears. Like in a nature video rushes where an animal appears for only a few seconds. Other types of video analysis can also detect problems in the video/audio, such as dropped frames, noise or colour gamut issues.