Doesn't work as all other useless buggy examples

[easy-and-simple]

Description

On my hardware yolo is working without problems and can detect objects from usb camera video or stream using the same gstreamer

gstreamer# python3 detect.py
No protocol specified
Unable to init server: Could not connect: Connection refused
No protocol specified
Unable to init server: Could not connect: Connection refused
Loading ../all_models/mobilenet_ssd_v2_coco_quant_postprocess_edgetpu.tflite with ../all_models/coco_labels.txt labels.
Gstreamer pipeline:
v4l2src device=/dev/video0 ! video/x-raw,width=640,height=480,framerate=30/1 ! tee name=t
t. ! queue max-size-buffers=1 leaky=downstream ! videoconvert ! videoscale ! video/x-raw,width=300,height=225 ! videobox name=box autocrop=true
! video/x-raw,format=RGB,width=300,height=300 ! appsink name=appsink emit-signals=true max-buffers=1 drop=true
t. ! queue max-size-buffers=1 leaky=downstream ! videoconvert
! rsvgoverlay name=overlay ! videoconvert ! ximagesink sync=false

No protocol specified
Error: gst-resource-error-quark: Could not initialise X output (10): ../sys/ximage/ximagesink.c(867): gst_x_image_sink_xcontext_get (): /GstPipeline:pipeline0/GstXImageSink:ximagesink0:
Could not open display

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opencv# python3 detect.py
Loading ../all_models/mobilenet_ssd_v2_coco_quant_postprocess_edgetpu.tflite with ../all_models/coco_labels.txt labels.
[ WARN:0] global ../modules/videoio/src/cap_gstreamer.cpp (961) open OpenCV | GStreamer warning: Cannot query video position: status=0, value=-1, duration=-1
No protocol specified
Unable to init server: Could not connect: Connection refused
Traceback (most recent call last):
File "/root/coral/examples-camera/opencv/detect.py", line 99, in
main()
File "/root/coral/examples-camera/opencv/detect.py", line 75, in main
cv2.imshow('frame', cv2_im)
cv2.error: OpenCV(4.5.1) ../modules/highgui/src/window_gtk.cpp:624: error: (-2:Unspecified error) Can't initialize GTK backend in function 'cvInitSystem'

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Issue Type

Bug, Build/Install, Performance, Support, Feature Request, Documentation Feature Request, Documentation Bug, Others

Operating System

Linux, Ubuntu

Coral Device

USB Accelerator, Mini PCIe, M.2 Accelerator A+E, M.2 Accelerator B+M, M.2 Accelerator with dual Edge TPU, Accelerator Module

Other Devices

No response

Programming Language

Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9, Other

Relevant Log Output

No response