Vuforia visualization problem

Hi! I've had a couple of days of this mistake and it would be great if you could help me out. I've followed step by step tutorials to create my virtual reality app at vuforia. When I hit play from the Unity editor the screen stays black and I can't even access the camera (or at least I can't see it) I realized that this happens when my elements are INSIDE the image target, but when I move them out they look very strange. I have attached some screenshots of what happens and the configuration of my camera. Thank you very much in advance,Hello! ! I've had a couple of days of this mistake and it would be great if you could help me out. I've followed step by step tutorials to create my virtual reality app at Vuforia. When I hit play from the Unity editor the screen stays black and I can't even access the camera (or at least I can't see it) I realized that this happens when my elements are INSIDE the image target, but when I move them out they look very strange. I have attached some screenshots of what happens and the configuration of my camera.

Thank you very much in advance