There are many solutions and they can all work for you, but each one offers a different aesthetic. So it really depends on the kind of look you want.
Something like a GoPro on a helmet or head strap can work, but the movement tends to be very jerky and unstable. Your head moves a lot more than you think it does. This looks more like reality TV.
You could rig something like a
snorricam, which is a way of mounting the camera right in front of the operator’s face with a complex harness that braces the camera to the operator’s head, shoulder, and torso (or a combination of any of those). This rig is more often used with the camera facing the operator, but can be used with the lens pointing away. Again, a very stylized look. It is more stable than a helmet cam but still has a movement that can be a little jerky based on the movement of the operator.
Steadicam, Glidecam, etc. could work, I guess. A 3-axis gimbal fits in this group. Smooth motion comes with practice and these are not tools to use straight out of the box. They take many hours to perfect. Motion is also stabilized and restricted a little bit more than POV may need.
The simplest and possibly most effective method may be just to shoot handheld. It’s not mechanically stabilized. Its movement isn’t dependent on being strapped to a body part like a forehead. It’s more organic and can move the way it needs to. This is probably your best bet and you won’t even have to buy new gear.