How to get vaapidech265 output as opencv BGR mat?

[Stephenwei]

 format              : The forced output pixel format
                        flags: 可讀, 可寫
                        Enum "GstVideoFormat" Default: 1, "encoded"
                           (0): unknown          - GST_VIDEO_FORMAT_UNKNOWN
                           (1): encoded          - GST_VIDEO_FORMAT_ENCODED
                           (2): i420             - GST_VIDEO_FORMAT_I420
                           (3): yv12             - GST_VIDEO_FORMAT_YV12
                           (4): yuy2             - GST_VIDEO_FORMAT_YUY2
                           (5): uyvy             - GST_VIDEO_FORMAT_UYVY
                           (6): ayuv             - GST_VIDEO_FORMAT_AYUV
                           (7): rgbx             - GST_VIDEO_FORMAT_RGBx
                           (8): bgrx             - GST_VIDEO_FORMAT_BGRx
                           (9): xrgb             - GST_VIDEO_FORMAT_xRGB
                           (10): xbgr             - GST_VIDEO_FORMAT_xBGR
                           (11): rgba             - GST_VIDEO_FORMAT_RGBA
                           (12): bgra             - GST_VIDEO_FORMAT_BGRA




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GStreamer is a convenient multimedia platform, I like it. 
Develop the NVR system on ARM/x86(c/python)
Use python to generate NVR is crazy, of course works fine.

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