Problem with RenderTexture in Unity trial

What i m doing is i m creating a camera which is placed above a plane to render it in a corner of screen and a character controller is used to move around in scene

Now, when i m doing nothing to this character controller then it is working properly but when i attaches RenderTexture to it's Target Texture property then this camera is not rendering anything but that camera which is i m using for rendering the plane (oh yeah, this plane is holding a material and that material is holding my RenderTexture as it's Texture) is working fine as the plane is rendering whatever the camera of charactercontroller is viewing

Basicly, what i m trying to do is i want to render the camera view of character controller to this plane and want to render this plane with another camera at a corner of screen

Pls help me out

One this i want to mention here is that i already tried to increase that Depth of camera which is rendering the plane in corner of screen