Add camera extrinsics rotation to match the Front-Right-Down convention

yaml/demo_visual_odometry_euroc.yaml

@@ -34,7 +34,7 @@ config:
       name: "CAMERA"
       plugin: "vision"
       extrinsic:
-        pose: [0,0,0,  0,0,0,1]
+        pose: [0,0,0, 0.5,-0.5,0.5,-0.5]
       using_raw: false
       follow: "camera_euroc_mav0.yaml"