No, not a single port on the MBP is linked to the LCD panel.
You can input video to a macbook pro using a dongle, except that there will be a lot of latency between the video and what appears on the screen. This doesn't matter when watching static images, but would render any game unplayable.
Buy a cheap external monitor with hdmi in, it'll be easier that way.
Edit: I still stand by my cheap external monitor: that intensity extreme thingy is $300. A small 32" LCD TV can be had for that price.