How to Animate Camera lookAt movement

Questions
3

thank you very much for your response
I have this code but could you guide me what I did wrong

FocusModel: function() {
      var rotationMatrix = new THREE.Matrix4();
      var targetQuaternion = new THREE.Quaternion();
      rotationMatrix.lookAt(
        this.picked_asset.position,
        this.camera.position,
        this.camera.up
      );
      targetQuaternion.setFromRotationMatrix(rotationMatrix);
     
       //Number of animation frames
      var animFrames = 200;
      //Pause between two consecutive animation frames
      var deltaT = 1;
      const goSlerping = acc => {
        if (acc >= 1) return;
        if (
          !this.camera.quaternion.equals(this.picked_asset.quaternion)
        ) {
          var step = 2 * acc;
          this.camera.quaternion.rotateTowards(
             targetQuaternion,
            step
          );
        }
        setTimeout(function() {
          goSlerping(acc + 1 / animFrames);
        }, deltaT);
      };
      goSlerping(1 / animFrames);
}