I have an extensive collection of old VHS and Hi 8mm video tapes. Holiday events with family as well as years worth of water skiing and vacation videos. I transferred them to digital years ago, at least 10 years ago and it is quite the project but well worth it!
What you have to be careful of is the tapes are so old now they can easily break or get eaten by the VCR. Hopefully you have stored them in a place that does not get too hot. I would recommend you test some tapes that you don't care about in your VCR before you put the ones in that you cannot replace.
Also the VCRs are so old now that the rubber rollers, belts and other wear items are shot. I have a Sony SLV-R1000 which is the best consumer Super VHS VCR ever made, it plays regular VHS tapes which are 240 lines of resolution as well as Super VHS which is 400 lines of resolution which was quite an improvement over standard VHS.
I also have a Sony EV-S7000 which is the top of the line Hi-8mm VCR which would play standard 8mm of 240 lines of resolution as well as Hi-8mm tapes which again were 400 lines of resolution. Before I embarked on my project since I had not used either for some time, I sent them to some guy I found on ebay that specialized in rebuilding older VCRs. He put all new wear items in and cleaned everything up. It was not cheap, but they worked flawlessly for me which was well worth it.
I bought a video capture card for my PC that fit into a PCI slot, and used some software by Cyberlink to import them. I connected the RCA jacks from the VCRs to the video capture card. Now I have all of my old videos on my hard drive along with a few backup. It's lots of time and effort but well worth it.
Some day I'll have time to edit all of my videos.