Sorry I took so long to get to this, I'd been meaning to respond, since this is actually something I actively do and it works well.
For capture hardware, what you want is something from
Yuan High-Tech or
Startech. Startech has their stuff made by Yuan High-Tech, so it is the same hardware, same drivers. They have excellent drivers with all the adjustments you might need and they export the device as a standard directshow device so everything can see it and use it no problem.
For software you can use anything that knows how to talk to a standard video device (like a webcam) but I recommend using
Open Broadcaster Software. It's free, and does the trick nicely. You set up a project in 640x480 which is the square pixel version of the NTSC standard (you could technically go lower using VHS) and have the video from the capture unit fill the whole screen. Then just have it archive to a file (turn off streaming). Setup your encoding settings to preference and based on what you have in your computer.
Using that records tapes like a charm. OBS also knows how to use Intel QuickSync and nVidia NVENC so you don't need a huge processor for encoding, though in general for things that low rez x264 cranked up gives better quality per bit and is unproblematic to run.