How do you draw or paste and image of a sniper scope when scoping to the player's camera so that there the cross thingy you aim at the middle? Like in games where the sniper scope isn't sctually bricks, its like a picture of one pasted in.
Use a GUI, probably an ImageLabel, to show things on the screen. You seem new to GUIs, so I would suggest looking here.
Guis are what you are looking for. They are the stuff you see on your screen that stay there and dont move. They are 2D images and texts. You can code them to do what you want, such as making a shop or a moving picture.