BTW there was other stuff, too
For example "Scanimates" which essentially consisted of some cameras, an analog computer and a CRT screen. You could feed the deflection signals through that analog computer.
If you were a boring German, the result would look like this:
If you had some more creativity and you did multiple passes, you could do things like this:
http://www.youtube.com/watch?v=ispW6-7b2sA (note the generous use of mock-3D and a tiny big of real 3D)
or even something like this:
http://www.youtube.com/watch?v=DPI63UKkdHY (starting ag around 0:25)
This usually involved ping-ponging video between 2 VTRs and adding layer after layer of motion. For this you needed the best VTRs you could get which back then where IVC 9000s. They were apparently so good you could go down 29 generations. The company went bust after shipping 69 (or so) of them. The BBC had only 2.
Eventually digital disk recorders became available which could store several minutes of, obviously uncompressed, video. Additionally there were digital video effects, essentially a dedicated box which could store a whole video frame and distort it digitally.
You could layer those effects by using hard disk recorders and later even digital video tape to create fairly nifty mock 3D.
Of course in the hands of the Germans you get something like this:
Or with the right drugs something like this:
http://www.youtube.com/watch?v=7kv7gCTqous (Note the colouring which could be done by quite a lot of machines, many video artists even built their own video colorizer)