Yes, it has everything you need - cameras, cables, DVR. Even mounting hardware, I do believe.
I recommend getting an installer who has experience with these things, the DVR was a bit quirky to set up. The guy I had do the installs does it for a living.
You can connect the DVR to a second video input on your TV. Select that input and you're looking at the camera feeds. Or you can view the feeds on a tablet or smart device.