The shader mixer setup for an indirect light camera is simple.

 

Open shader mixer.

File New Shader

Choose Camera

Grab the Indirect Light (camera) brick from the Root Bricks > Light Category and drop it in.

Click Create

 

You now have an IDL camera.  The IDL will only show through this camera.  THe controls for the IDL are on the camera, pretty straightforward.  I recommend the first thing you to do is drop the trace distance down to something reasonable like 50 cm.