Applying renderTexture to camera1 it takes full screen and overlaps camera 2

Im using ffmpeg to broadcast video. Im passing a RenderTexture to camera1.targetTexture. Then I pass camera1.targetTexture to ffmpeg for broadcasting my cameras. On my GUI canvas I have 2 cameras side by side. When I apply the Render texture to camera1.targetTexture I get a full screen of camera1 and overlaps camera2. Is there a way to make camera 1 have the same dimension and position after calling camera.targetTexture = _tempRT and not overlap camera2?

 if (camera.targetTexture == null)
                 {
                     _tempRT = new RenderTexture(_width, _height, 24, GetTargetFormat(camera)); 
                     _tempRT.antiAliasing = GetAntiAliasingLevel(camera);
                     camera.targetTexture = _tempRT;//This sets the camera full screen
                     _blitter = Blitter.CreateInstance(camera);
                 }