Marking door strike plate location - GIF

[Toolmaker51]

The pencil-transfer to paint is ok...remainder of vid is more door frame than strike plate. Someone should send him a subscription to a dating site for helper, or youtube of "Tripods; A-Z".
I put one layer of light color masking tape on jamb, and HB lead pencil the bolt.

PS; editing in.
Just noticed, there's no demonstration of latching. Marking striker face won't indicate the back [straight] face and might not engage smoothly, with inadequate set back.
Also might not be Mr. Finish-Carpenter to start with, chisel mark outline of plate look like claw hammer tips....