unity3d - How can I make a blue box effect similar to that of windows, In Unity 3d

Question

So I want to make a feature where there a lot of small humans (from top cam view) can be selected by the player this way as shown in image, and I am using unity 3d. I think that ray might work and I don't know much about rays. My cam angle is similar to this game and it also have that blue box feature.

question from:https://stackoverflow.com/questions/65626733/how-can-i-make-a-blue-box-effect-similar-to-that-of-windows-in-unity-3d

Answer 1

Waitting for answers