How to get path and filename from postman request body using Go

This question already asked but it is not solve my issue.

In my Go project am not able to print path and filename. It is showing some error like below:

2021/10/13 16:25:07 http: panic serving [::1]:60170: runtime error: invalid memory address or nil pointer dereference
goroutine 6 [running]:

My Postman collection

my code

package main
import (
	"fmt"
	"net/http"
	"github.com/gorilla/mux"
)
func encodeFfmpeg(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "multipart/form-data")
	_, header, _ := r.FormFile("video")
	fmt.Println(header.Filename)
}
func main() {
	router := mux.NewRouter()
	router.HandleFunc("/encode", encodeFfmpeg).Methods("POST")
	// config port
	fmt.Printf("Starting server at 8080 \n")
	http.ListenAndServe(":8080", router)
}

>Am trying to print filename with path eg: /home/ramesh/videos/video.mp4

The sent request is missing the boundary parameter in the Content-Type header. This parameter is required for multipart/form-data to work properly.

In Postman remove the explicit Content-Type header setting and leave it to Postman to automatically set the header with the boundary parameter.

For more see: https://stackoverflow.com/a/16022213/965900 & https://stackoverflow.com/a/41435972/965900

Last but not least, do not ignore errors.