With the existing Vantage feature set, you could save your current camera settings as a new camera slot in the camera lister, then zoom and look around as much as you want and load back that camera.
What I’m referring to is the right-click zoom feature in the V-Ray render frame window. When you right-click, the view zooms into a region to inspect details without changing the camera’s perspective. You are still within the original camera view; it’s just a local magnification.
By contrast, regular zooming alters the camera angle. What I want is to examine fine details while staying within the original camera perspective.