First off, you should probably explain what exactly you would be doing. If you're transfering files from your PC to your Mac-to-be, all you would need is to dump the files on an external HD, and then copy them on your mac. There are several applications that come with the Mac that are used for reading/editing video. The most important of these is Quicktime, which, when you get the right codecs (flip4mac and peryan, both free), will allow you to read just about any format you would need. For slightly more control, and the ability to do basic editing and exporting, you can get a license to QT pro ($20), which I would recomend. Editing of video on a mac, is once again fairly simple. A mac comes with a piece of video editing software called iMovie. iMovie is a linear video editior, which, for being free, is very powerful, and can be used to create some relatively complex edits. For more power, and the ability to do non-linear editing, you can get a copy of Final Cut Express ($150 educational/ $300 regular), or, if you're a pro, you can get Final Cut Studio ($600 educational/ $1200 regular).
Now, if your question was more about how you would dump the raw video from your camera to your potential Mac, the answer would be slightly more complicated. It would depend on the video format you shoot. Any miniDV camcorder with a 1394 (iLink/firewire) connection can be plugged into a mac, and the clips can be imported into either iMovie, or one of the Final Cuts. A HD camcorder, will work like an external HD, which will allow you to dump your files (via USB), and then convert them with QT. DVD camcorders are a real pain, in that the video is already encoded. This would involve you ripping the video to your machine with something like Handbrake, MacTheRipper, ffMPEGX, or MPEG Streamclip, and then go on editing it in one of the editiors. Hope this answers your question. If you're really into video, I would have a hard time imagining editing footage on something other than a Mac. It's straight- forward, intuitive, and the systems are optimized for this. Cheers.