Hi -
This is probably not what you want to hear, but tape based cameras must use firewire to import the video from the tape.
Here is the link to the Apple iMovie '09 Camera Support list:
https://support.apple.com/kb/HT3290
If you can have the camera record to a memory card, and not the tape, then you might be able to use USB to ingest those files.
Also, if you can get access to a computer that has firewire ports, you could use that computer to load the footage to an external disk drive. Then move the drive to your computer and
import the files to edit.
Hope this helps.