Get bounding box of an object from camera point of view?

Hello. I’m trying to calculate bounding box of this character from that camera point of view (in image/pixel space). So for example the result would be: TopLeft_X: 305px, TopLeft_Y: 110px, BotRight_X: 420px, BotRight_Y: 380px.

I wanna probably use some bounding box related functions/nodes and distance vectors but not quite sure how to do the math. Any ideas how should I approach this please?