Error: This application failed to start because no Qt platform plugin could be initialized.

[khandriod]

Hi I am using a Docker container to run this model, but it is throwing me Aborted (core dumped) error.

qt.qpa.xcb: could not connect to display :1 qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/usr/local/lib/python3.5/dist-packages/cv2/qt/plugins" even though it was found. This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem

this is how I am using the command,
python3 demo_video.py --video off.mp4 --display 0 --output output.mp4

Seems like problem is with --display argument.

It take so much time on this step.