This example uses:
$ go get go.opencensus.io/examples/grpc/...
First, run the server:
$ go run $(go env GOPATH)/src/go.opencensus.io/examples/grpc/helloworld_server/main.go
Then, run the client:
$ go run $(go env GOPATH)/src/go.opencensus.io/examples/grpc/helloworld_client/main.go
You will see traces and stats exported on the stdout. You can use one of the exporters to upload collected data to the backend of your choice.
You can also see the z-pages provided from the server: