Dear PAS and dear Zvonko,
Thank you very much,
Now I know.
Very best wishes from Vancouver,
is what you need.
They are not very expensive - ca. 50 EUR.
They all have video inputs, to which you then hook up your VCR and follow the instructions with the supplied software.
The card also lets you watch TV on your computer while you translate
If this piece of hardware is not what you always dreamed of and the video is just a few minutes long, then the easiest option would be to find a photo lab which makes DVD's out of video tapes. It's not very cheap (15-20 EUR per disc in Warsaw), but if it's a one time thing, then it's probably your best option.