avfilter/vf_zoompan: support planar rgb pixel formats

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/vf_zoompan.c

@@ -262,6 +262,7 @@ static int query_formats(AVFilterContext *ctx)
         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
         AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
         AV_PIX_FMT_YUVJ411P,
+        AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
         AV_PIX_FMT_GRAY8,
         AV_PIX_FMT_NONE
     };