Cry of Fear has new entities because it isn't vanilla GoldSource.
There's an entity called
"camera_model" in the Cry of Fear FGD, with these attributes:
Name
Moves with
Model name
Animation 1
Animation 2
Animation 3
Animation 4
Animation 5I don't know how to use it because I never mapped for Cry of Fear, but I took a look at the FGD some time ago to figure out by myself what techniques the developers used to make specific things (especially the door fading effect and teleport to the other side) since I've played the game several times to study it.
I think this is the answer you were searching but, unfortunately, you can't make such a thing with vanilla GoldSource, except creating a new model and animate the moving bone itself. But as the video uploader said:
"It's possible, but it will be very difficult to see where the camera bone is viewing at."
Anyway, if you really want to do such things, I recommend you to download the Cry of Fear SDK
HERE. But remember that you NEED Cry of Fear installed to test your maps with this SDK. Just download it through Steam if you haven't already.
I hope it helps.