Camera movement forwards and backwards on mouse click

Development Programming & Scripting
1

I am trying to replicate the camera move on button click show here

https://d3kjluh73b9h9o.cloudfront.net/uploads/default/original/3X/3/6/36aa4b7a6bbf32ee54abaf2e2d51ca7ad8de6c05.png

But I am not sure how he is creating the set initial mouse position x and initial mouse position y after input actiion

also later later after he goes from make vector 2s he has initial mouse position but I am not sure how I am supposed to add this into my blue print.

2

Is this what you are asking for?