Gui texture on second camera?

I'm making a game with a minimap and I need some help. My minimap camera blends in with the area and I want to but a black box around it (I have the texture). I need to put that texture in the second camera but not the main camera. Can someone help?

 

Yes you can do that by putting script on your minimap camera and adjusting your GUI

GUI is Text+Textures Like a simple flattest screen on players face !

 

Sorry for responding so late, can you go over this in a little more detail please (I'm extremely new to gane development, but I'm working with people from respond entertainment (the people who made titanfall) and I want to seem more experienced and learn more for them).

Can I just have a detailed list or something, if so thanks. If not then I'm sure I'll figure it out.