What HW are you using? I am mainly wondering about the light setup. I am using an ESP-CAM with a built in LED but it creates a big reflection. I even bought some LED ring lights but I do not know how to wire them to the ESP and have it trigger is instead of the built in LED.
Nice work. How did you fix the camera above the meter? Did you 3D-print some holder?
Very nice work, maybe you want to share your work how you managed this. 
Jumping on the band-wagon. If anyone spent the time designing a bracket to mount ESP cam to this meter I would be glad to benefit from that effort 
…being honest here. Thanks.
Edit: Found one: https://cults3d.com/en/3d-model/home/halter-esp32-cam-antenne-fuer-digitaler-wasserzaehler-axioma-qalcosonic-w1-fuer-a