I made this guide before Ezreal jungle was played in the LCS. I updated it a bit during patch 7.24 with the new runes and a few additional items from Probuilds and LolBuilds.jp. There are now a lot more VoDs to watch, but at the time, this was all that was available.
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I remembered seeing a few high Elo players and streamers playing Ezreal jungle, so I'd thought I'd write down their builds for anyone who is curious.

The high Elo players I found jungle Ezreal VoDs for were scarra, vman, and saintvicious.

The VoD links will probably stop working pretty quickly, but I took screenshots of the builds as well.

Scarra
VoD 1, build
VoD 2, build

Vman7
VoD, build

saintvicious
VoD, build

After writing the majority of this guide, I found another VoD of Nukeduck playing jungle Ezreal on Youtube

As of preseason 9, Ezreal jungle has become meta, then been nerfed and fallen out of meta again, and now Dark Harvest has just been reworked.

While I don't have much to go on now either, I did see that Dardoch, an NA pro jungler, played AD Ezreal jungle with Electrocute

In interesting new development, Link, former CLG mid laner, played AP Ezreal jungle with Dark Harvest, and Inori, a professional jungler who recently jungled for Team Liquid, is experimenting with a hybrid AD build with Hextech Gunblade and Dark Harvest.

While I'm not sure we'll see a resurgence of AD Ezreal jungle unless Ezreal gets buffed again, the AP build with Dark Harvest might be something to experiment with and be on the lookout for.