Just started shooting with a DSLR. I have several consumer level HD camcorders that shoot very nice video with everything in focus.

Was going to buy a wide angle lens for my 7D, but since wide angle typically is a deep depth of field, can I get away using one of my camcorders ? Idea is to mix 1920x1080 30p footage from camcorder with footage from the DSLR.

Use whatever tool is appropriate for the job. You can also get a deep depth of field by stopping down a lens to something like f11 but it is probably cheaper and easier to use one of your other camcorders.