I believe the Hi-8 format is analog not digital so don't think you can. I have a Sony Digital-8 camcorder that uses an
8mm tape to record on but in digital format. The nice feature is that I can run my old 8mm & Hi-8mm tapes through it and it
spits them out in digital format which I can then edit on my PC with an editing program such as Windows Movie Maker (free)
or Adobe Premiere Elements (powerful-cheap program). You need a device (in my case my digital8 camcorder) to pass thru
and covert the analog data to digital. Once it is digital the software can capture individual frames, separate audio and video, add
sound tracks, add narration and a whole host of neat effects and transitions.