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I found a solution for this.

Tested - working fine. :)

Just added few lines of code to OpenCV Library JavaCameraView class.

Step 1. Go to OpenCVLibrary > Java > org.opencv > android > JavaCameraView

Step 2. Add this method anywhere in the JavaCameraView class

private void setDisplayOrientation(Camera mCamera, int angle) {
    Method downPolymorphic;
    try
    {
        downPolymorphic = mCamera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class });
        if (downPolymorphic != null)
            downPolymorphic.invoke(mCamera, new Object[] { angle });
    }
    catch (Exception e1)
    {
    }
}

Step 3. Search for mCamera.startPreview(); in the class and paste this code just above this.

setDisplayOrientation(mCamera, 90);
mCamera.setPreviewDisplay(getHolder());

Just like this.

Run your code.

Happy Coding!