If you have a mini DV camera it should have come with a cable to connect it to an analog input of a tv or VCR. Many time, the same cable can go backwards. Connect the 8mm player analog output to the mini DV camera using the mini DVs connector cable. If you put the mini DV camera in "tape" mode and press record/pause, it changes the cable from an output to an input. Press play on the 8mm playback and record on the DV camera. Your 8mm content is now recording to DV tape. If your camera allows it, you can skip recording to tape and use the firewire cable to connect it to a computer. The camera acts as a converter.
You can pay me now. LOL