Integrating ghost node app to an existing node js app at "/blog"

My node js version is v0.12.0. I am using express. In my application, my app runs at localhost:3000 port and ghost blog app runs on port 2368. I want ghost blog to run at localhost:3000/blog. How can I do this?

server.js

var express = require('express'),http = require('http');; 
var app = express();
var  path = require('path');
var cookieParser = require('cookie-parser');
// load the cookie parsing middleware
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.set('views', './views');
app.set('view engine', 'ejs');
app.get('/', function(req, res){ 
    res.render('index');
 });
var ghost = require('ghost');

// existing node application
app.route({
   method: 'GET',
   path: '/',
   handler: function(request, reply) {
    reply('hello');
  }
});

// proxy to ghost blog     -----------------------> this part is not working
app.route({
    method: 'GET',
    path: '/blog/{p*}',
    handler: {
        proxy: {
           host: '0.0.0.0',
           port: '2368'
           }
        } 
  });

  ghost({
      config: path.join(__dirname, 'config.js')
        }).then(function (ghostServer) {
      ghostServer.start();
   });

  app.listen(3000);