Hi everyone, just starting learning Houdini here.

I am trying to get a camera to follow a path and the look at a geo object.
Now, my geo is a OBJ of a man, and I would like to camera to look at the head, which is not the geo centre point. How can I get the camera to look at the head while following the path?

You could use a rivet object or point constraint on a Null to constrain the Null to the character's head. Then use that Null object as the look at object for the camera.

try this, just using the shelf tools
have a look inside the camera constraint network