Use write_json with zed

[lpsantao]

Hello,

I'm having issues when trying to use the "write_json" flag from the original OpenPose repository with zed_openpose.
I tried to create an op::WrapperStructOutput with the path for the json files in the write_json flag , but it did not work:

op::WrapperStructOutput wrapperStructOutput{ -1, op::String(""), op::DataFormat::Json, op::String(FLAGS_write_json) };

Any tips on how to do it?
Thank you!

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