Hello and welcome.
-Are you running macOS Sierra 10.12.x?
-Which version of iMovie - 10.1.5?
-Since that camera was introduced in 2007 or so, it doesn't seem to be supported by iMovie -
iMovie supported cameras.
-The DV port is a version of FireWire, but I don't believe you could use adapters to get it to connect, because of the above.
I think your best bet may be to have someone convert the tapes for you.
C