Appsink doesnt work with imxiputransform in opencv video capture

Technical Support
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1

here is my cpp code:

cv::VideoCapture captureVideoInLabel;
captureVideoInLabel.open("imxv4l2videosrc device=/dev/video0 ! imxiputransform ! video/x-raw,format=BGR,width=720,height=576,framerate=25/1 ! appsink", cv::CAP_GSTREAMER);

with BGRA format gst-launch-1.0 works fine but opencv doesnt support BGRA, just support BGR.