how can I use http2.0 without ssl on linux with nginx

I want to send or accept http2.0, but I don`t want use SSL, because I want capture the bag for the study。 I had search some knowledge, that say nginx can use http2.0 without SSL, SSL is a must for the browser so I think I can use postman or curl and other serverce for send reques. now, I want to know how can I deploy the nginx