The following command is on how to apply passthrough option:
ffmpeg -init_hw_device vulkan -i input.264 -vf hwupload=extra_hw_frames=16,transpose_vulkan=passthrough=landscape,hwdownload,format=yuv420p output.264
c7c37a8f22 transpose_vulkan: add passthrough option
libavfilter/vf_transpose_vulkan.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)