ViewportToWorldPoint

 

Ex1

Camera camera = GetComponent<Camera>();
Vector3 p = camera.ViewportToWorldPoint(new Vector3(1, 1, camera.nearClipPlane));
Gizmos.color = Color.yellow;
Gizmos.DrawSphere(p, 0.1F);

 

Ex2

var wp1 = Camera.main.ViewportToWorldPoint(new Vector3(0.5f, 0.5f, Camera.main.transform.position.z));
var wp2 = Camera.main.ViewportToWorldPoint(new Vector3(0.75f, 0.5f, Camera.main.transform.position.z));
var wpd = new Vector2(wp2.x - wp1.x, wp2.y - wp1.y);
Camera.main.transform.position =
	new Vector3(pypos.x + wpd.x, pypos.y + wpd.y, Camera.main.transform.position.z);