Add parameter for tracks_preprocessor

yaml/demo_visual_odometry_euroc.yaml

@@ -97,6 +97,11 @@ config:
         feature_kfs:
           thickness: 0.1
           size_pix: 1
+      tracks_preprocess:
+        show: false
+        show_on_diff_topic: false
+        thickness: 1.5
+        color: "CYAN"
       landmarks:
         show_id: false
         size_id: 0.5