How to display stream video from PvBuffer (Pleora SDK) to - > Opencv buffer

I have problem to convert the (Pleora SDK)PvBuffer into an Opencv buffer and display the stream.

This is the sample code from (Pleora SDK C++) with the added modification.

while ( !PvKbHit() )
{
    PvBuffer *lBuffer = NULL;
    PvResult lOperationResult;


    // Retrieve next buffer
    PvResult lResult = aStream->RetrieveBuffer( &lBuffer, &lOperationResult, 1000 );
    if ( lResult.IsOK() )
    {
        if ( lOperationResult.IsOK() )
        {
            PvPayloadType lType;

            //
            // We now have a valid buffer. This is where you would typically process the buffer.
            // -----------------------------------------------------------------------------------------
            // ...

            lFrameRate->GetValue( lFrameRateVal );
            lBandwidth->GetValue( lBandwidthVal );

            // If the buffer contains an image, display width and height.
            uint32_t lWidth = 0, lHeight = 0;
            lType = lBuffer->GetPayloadType();

            cout << fixed << setprecision( 1 );
            cout << lDoodle[ lDoodleIndex ];
            cout << " BlockID: " << uppercase << hex << setfill( '0' ) << setw( 16 ) << lBuffer->GetBlockID();
            if ( lType == PvPayloadTypeImage )
            {
                // Get image specific buffer interface.
                PvImage *lImage = lBuffer->GetImage();

                // Read width, height.
                lWidth = lImage->GetWidth();
                lHeight = lImage->GetHeight();
                cout << "  W: " << dec << lWidth << " H: " << lHeight;




                //********* added modifications ******

                namedWindow("cam", CV_WINDOW_AUTOSIZE);
                cv::Mat workImage;
                lImage->Alloc(lWidth, lHeight, lBuffer->GetImage()->GetPixelType());
                // Get image data pointer so we can pass it to CV::MAT container
                unsigned char *img = lImage->GetDataPointer();

                // Copy/convert Pleora Vision image pointer to cv::Mat container
                cv::Mat lframe(lHeight, lWidth, CV_8U, img, cv::Mat::AUTO_STEP);


                lframe.copyTo(workImage);
                cv::imshow("cam",workImage);


            }

With the added lines I am trying to convert the buffer into a Mat and also to display the stream as well but without success . .