If you have a fairly new mac then you need a 400 to 800 firewire cable. Looks like that Cam has the full size 400 cable not the mini ones on many mini-cams. Imovie supports HDV. Try it and if its not working explain the problem. Plenty of Imovie forums. If Imovie is not seeing the cam then try quitting Imovie and having the camera booted up and in playback mode and try launching Imovie. Still not working try rebooting the Mac. I don’t use this combo but this was my experience in the past.
OSX 10.5.8; MacBookPro4,1 Intel Core 2 Duo 2.5 GHz MacPro4,1 2.66GHz 8 core 12gigs of ram. GPU: Nvidia Geoforce GT120 with Vram 512. OS X 10.6.x; Camcorders: Sony Z7U, Canon HV30/40, Sony vx2000/PD170; FCP 6 certified; write professionally for a variety of media; teach video production in L.A.