After Effects Mocha tracking data no mouth effect

The first thing I would do with that shot is motion stabilize the face. That would be easy to do using AE's Stabilize motion easily available in the Motion Tracking workspace. Here's how I would set that up:

That will give you this:

When you have that done you have a face that doesn't move much. Duplicate the layer, Pre-compose the duplicate making sure you move all attributes to the new comp, name the pre-comp, open the Paint workspace, right-click on the face comp and open the layer, then use the clone tool to cover the mouth. You'll get something like this:

Go back to your default workspace and add a blue solid to the comp, set the blend mode to Overlay, then draw a mask around the mouth. The blend mode allows you to see through the layer and accurately adjust the mask. That will give you something like this and you probably won't need to add any keyframes to the mask.

The next step is to add some blur to your Pre-comp layer and set the blue solid as a track matte. You'll get something like this:

The last step is to remove the stabilizing and add the motion to the other layers. Start by renaming the original footage "stabilized" then add a null to the top of the timeline. Move the CTI to the first frame and apply this animation preset to the Null layer. 

Here are the expressions that will be added to the Null:

//Position
thisComp.layer("stabilized").transform.anchorPoint

//Scale
x = value[0];
y = value[1];
tx = thisComp.layer("stabilized").transform.scale[0];
ty = thisComp.layer("stabilized").transform.scale[1];
nx = x/tx*x;
ny = y/ty*y;
[nx, ny]

//Rotation
- thisComp.layer("stabilized").rotation

The last step is to parent all layers to the Null layer. This will remove the stabilization from the original footage and add that motion to the other layers. I ended up having to make just 3 mask keyframes to keep things working perfectly. It took about 10 minutes. Here's the final screenshot:

And here is a project file for you to look at that used your uploaded footage. That's the difference between an amateur approach and an efficient professional workflow.

If the shot was different, I would have used a different workflow.