Is there a camera technique to visualize currents like in a thermal view?
Schlieren for magnetics or something?
High Speed Imaging Of Magnetic Fields

Some time before experimenting with MRI machines and building his own CT scanner, [Peter Jansen] wanted to visualize magnetic fields. One of his small side projects is building tricoders — po…

Hackaday
@marble is the AIM TTi I-prober 520 maybe something that could help? Not really like a camera but maybe enough with a oscilloscope.
@tenerya this looks really nice
I might make a makeshift version if I find the linear hall sensors in my stuff :D