Sync crowd-detection from metro-analytics-catalog

README.md

@@ -236,8 +236,9 @@ bus.timed_pop_filtered(
 pipeline.set_state(Gst.State.NULL)
 ```
 
-To run on integrated GPU, change `device=CPU` to `device=GPU` and add
-`vapostproc` after `jpegdec` for zero-copy color conversion.
+To run on integrated GPU, change `device=CPU` to `device=GPU`, add
+`vapostproc ! video/x-raw(memory:VASurface)` after `jpegdec`, and set
+`pre-process-backend=vaapi-surface-sharing` on `gvadetect`.
 For NPU, change `device=CPU` to `device=NPU`.
 
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