Dean, I used to use a JVC HM 750 and found out the hard way that you’ll never be able to import those MOV files into Pro 12. Pro 14 might be able to do that but I retired before that version came out so I never got to try it.
I know that Premiere Pro will import the files with no problem so, if you have access to it, problem solved.
If you don’t, what does work is a free utility from the folks at Convergent Design. It transcodes the MOV file to an MXF file that can be read in Pro 12. They keep changing the location of it so I kept a copy of it on my Dropbox account.
It’s been a very long time since I used it but hopefully the instructions will be self explanatory.
Here’s a direct link to the zipped file. Good luck.
https://dl.dropboxusercontent.com/u/20488019/Sony%20Vegas/FileConverter_1.6PC.zip