How do you connect a Canon Vixia HV40 video camera to a mac with a usb cable?

Your best bet is to visit the Canon site for a manual on your Vixia HV40. The manual will tell you how to connect the video camera to your Mac computer (via USB cable). The URL posted below takes you to the Canon site. Copy and paste the URL into your address bar.

Note: You will need to know the model number of your Vixia to find the correct manual.

http://manualsforall.com/cannon/cannon-manuals.html