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Ubuntu 18 Qt 5.12 Opencv 3.2.

I updated CannyQml.pro as below:

CannyQml.pro
+++++++++++++++++++++++++++++
CONFIG += c++11

SOURCES += main.cpp
videofilter.cpp

RESOURCES += qml.qrc

Additional import path used to resolve QML modules in Qt Creator's code model

QML_IMPORT_PATH =

Default rules for deployment.

include(deployment.pri)

HEADERS +=
videofilter.h

unix{
INCLUDEPATH += /usr/include/opencv
LIBS += -L/usr/lib/x86_64-linux-gnu/
-lopencv_core
-lopencv_imgproc
-lopencv_highgui
-lopencv_calib3d
-lopencv_features2d
-lopencv_imgcodecs
-lopencv_videoio
}

The GUI runs for 1sec

But I get to see the below error
++++++++++++++++++++++++++++++

12:55:15: Starting /home/mike/Downloads/Qt_OpenCV-master/QtQuick/build-CannyQml-Desktop_Qt_5_12_0_GCC_64bit-Debug/CannyQml...
QML debugging is enabled. Only use this in a safe environment.

(CannyQml:5074): GStreamer-CRITICAL **: 12:55:23.000: write map requested on non-writable buffer
12:55:23: The program has unexpectedly finished.
12:55:23: The process was ended forcefully.
12:55:23: /home/mike/Downloads/Qt_OpenCV-master/QtQuick/build-CannyQml-Desktop_Qt_5_12_0_GCC_64bit-Debug/CannyQml crashed.