Camera preview follow ground

Im making a preview camera of a level. Currently the camera goes directly to the end of the level, but i would like it to follow the ground.

My current script

if (target)
		{
			Vector3 posNoZ = transform.position;
			posNoZ.z = target.transform.position.z;

			Vector3 targetDirection = (target.transform.position - posNoZ);

			interpVelocity = targetDirection.magnitude * speed;

			targetPos = transform.position + (targetDirection.normalized * interpVelocity * Time.deltaTime);

			transform.position = Vector3.Lerp(transform.position, targetPos + offset, 0.25f);

		}

Maby try following empty objects instead of ground. Something like this:

Thanks for the video tip!