Reddit mentions of CRC Urethane Seal Coat Viscous Liquid Coating, 250 Degree F Maximum Temperature, 11 oz Aerosol Can, Clear - 18411

If you are handy with a soldering iron, and the traces are corroded, you could probably take some insulated wires and use that to replace any corroded traces.

If you do get it working, I would suggest applying a conformal coating http://www.amazon.com/CRC-Urethane-Viscous-Coating-Temperature/dp/B000IC7ZQ2/ref=sr_1_1?ie=UTF8&qid=1421522421&sr=8-1&keywords=conformal+coating&pebp=1421522429621&peasin=B000IC7ZQ2 which will waterproof the printed wiring board.

You could just open it and spray the internals with this:

CRC Urethane Seal Coat Viscous Liquid Coating, 250 Degree F Maximum Temperature, 11 oz Aerosol Can, Clear https://www.amazon.com/dp/B000IC7ZQ2/ref=cm_sw_r_cp_api_P34DybY8MS46N

There are cases that combine the pi zero with the camera integrated into the lid. I've had success using Motion to run the camera, live streaming (viewing over VPN remotely) and auto loading into Google Drive and Photos (inotify, rsync) with email notifications. If you added a small battery from Adafruit and the UPS linked below, you could have a small package for some pretty good video.

You can assemble the hardware, and spray with electronics waterproofing to allow for rugged use. Probably best to silicone in micro USB power and USB cables to the pi first, then cap the ends when disconnected.

I havent used the UPS with the listed case, but some mods may work. The issue will be the cost, all said and done it will cost about 65 for a complete kit, and if you aren't familiar with the software process it will take the average non-initiated about 2 weeks of determined self teaching to make it all work

Raspberry Pi Zero: $14:
https://www.adafruit.com/product/3708

Zero2Go: $20 https://www.adafruit.com/product/4114

Battery: $15:
https://www.adafruit.com/product/328

Kit with preferred case: $26:
https://www.amazon.com/Vilros-Raspberry-Starter-Power-Premium/dp/B0748MPQT4/ref=mp_s_a_1_3?keywords=raspberry+pi+0+case&qid=1554653377&s=gateway&sr=8-3

Camera: $13:
https://www.amazon.com/Raspberry-Camera-Module-Webcam-Support/dp/B0748FZXW3/ref=mp_s_a_1_3?crid=115XCG0UJFB2O&keywords=raspberry+pi+0+camera&qid=1554653486&s=gateway&sprefix=raspberry+pi+0+&sr=8-3

Water Proof Spray: $14:
https://www.amazon.com/CRC-Urethane-Viscous-Coating-Temperature/dp/B000IC7ZQ2/ref=mp_s_a_1_2?crid=BJN7ZAM77XCW&keywords=electronics+waterproofing+spray&qid=1554653537&s=gateway&sprefix=electronics+water&sr=8-2

Mine's been outside about a year or so now.

Huh neat! I had no idea such a thing existed, would this work the same? https://www.amazon.com/CRC-Urethane-Viscous-Coating-Temperature/dp/B000IC7ZQ2/ref=sr_1_4?crid=1BNAX76GEYEN4&keywords=conformal+coating&qid=1565674664&s=gateway&sprefix=conformal%2Caps%2C191&sr=8-4 I have the shakiest hands known to man so a spray can will work a hell of a lot better than a paint brush for me.

From what I gather there's some stuff called coat seal that can sprayed over the board. But I'm not too sure how it would work if the board is submerged. Wish the best of luck for you though

CRC Urethane Seal Coat Viscous Liquid Coating, 250 Degree F Maximum Temperature, 11 oz Aerosol Can, Clear - 18411 https://www.amazon.com/dp/B000IC7ZQ2/ref=cm_sw_r_cp_apa_i_Q5QjDbEE0GFY3

Looks like Potting Compound

If I wanted to protect it from the elements I'd get some CRC soft-seal spray or something instead maybe.. like this kind of thing: https://www.amazon.com/CRC-Urethane-Viscous-Coating-Temperature/dp/B000IC7ZQ2

CRC Urethane Seal Coat Viscous Liquid Coating, 250 Degree F Maximum Temperature, 11 oz Aerosol Can, Clear
https://www.amazon.com/gp/product/B000IC7ZQ2/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1