The presenter in the video is aquatic biologist & fly fishing author Rick Hafele, who gives one of the clearest & most useful explanations on reading water I've seen. With on the stream demonstrations & descriptions of what's actually going on below the surface, this is one of the most useful videos for any fly angler. I really can't recommend it enough.
Although it's from 1984, the information here is not dated in any way, as trout streams still work the same way - indeed the way they did 100 years ago. Do yourself a favor: help your fishing abilities & catch more trout by watching these videos. What can take an angler a lifetime to learn on the stream is presented here in an hour.