Hi! We'd need more information, as I don' understand the question. To "look through" the camera, you just select the Corona Camera in the viewport settings, just as you would for a native C4D camera.
If you mean there's no view when you use Interactive Rendering of final rendering, the question would be what do you see - anything? Just black? Are there lights in the scene? Are there any other objects in the scene that your camera may accidentally be inside or behind? (This last one being no different than any other camera of course).
Some screengrabs of your scene set up may help, as well as what you get in the viewport and/or the VFB, depending on what the question means :)
