Add risk-overlay demo GIF and video to model card

.gitattributes

@@ -33,3 +33,5 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zip filter=lfs diff=lfs merge=lfs -text
 *.zst filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
+demo.gif filter=lfs diff=lfs merge=lfs -text
+demo.mp4 filter=lfs diff=lfs merge=lfs -text

README.md

@@ -31,6 +31,17 @@ dataset grows.
 - **Input size**: 640x640
 - **Classes**: `pedestrian` (0), `2-wheeler` (1), `3-wheeler` (2), `4-wheeler` (3)
 
+## Demo
+
+![Risk-zone demo on a congested street](demo.gif)
+
+The model wired into a simple proximity risk overlay: safe objects get a
+thin green outline, close objects are tagged orange (caution) or red
+(critical). The footage is a clip from the raw archive that ships with
+the training dataset. A higher-quality video of the same run is in this
+repo as `demo.mp4`, and the overlay code is part of the project's demo
+app.
+
 ## Usage
 
 ```python

demo.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:60a7c01e850e915602abd65216e7d3b07a4599d2e021f2bbe684a7420d27e99b
+size 3341865