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onnx: add overlay renderer

Aaron Boxer requested to merge boxerab/gst-plugins-bad:onnx_overlay_minimal into master

Screenshot_from_2021-04-28_14-28-20

This MR adds a pango-based element onnxoverlayrenderer to render bounding box and label meta data generated by the onnxobjectdetector element. See ONNX MR for more details on onnxobjectdetector.

Sample pipeline:

uridecodebin  uri=file:///crowd_people_in_city_town.mp4  !
videoconvert !
onnxobjectdetector 
box-node-index=0
class-node-index=1
score-node-index=2
detection-node-index=3
execution-provider=cpu
model-file=onnx-runtime-examples/data/models/model.onnx  label-file=onnx-runtime-examples/data/labels/COCO_classes.txt  ! 
onnxoverlayrenderer !
autovideoconvert !
autovideosink
Edited by Aaron Boxer

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