Talking to some friends and one of them mentioned the PSQ-20 ENVG (Enhanced Night Vision Goggle). He described it as Night Vision with thermal vision.

So I found this video to share with you all. This is just plain cheating LOL.

There are commercial versions available and a real bargain at only $15,000 LOL.

If you watch this video you can see that the thermal image is superimposed over the night vision image. Possibly with the use of a prism?