Is yorick jungle still viable?

It is definitely still a thing, but it is even more situational than Top lane Yorick, since he relies on having strong carries even more when jungling. You'll want to max either E for sustain or W for max clear speed, and either go for warrior if you want high early pressure or Cinderhulk if you want strong late game scaling. Otherwise, I'd say go tier 2 jungle item into tear into tier three jungle item and then straight tank afterwards. You sustain pretty well by spamming ghouls on the camps and using you E, just make sure to watch your mana. Your banks are ok, but you have to pull off a solid flank so you can drop your damage on the enemy as they run back to tower. Late game, just make sure to ult your strongest carry.

Who is yorick?

Sorry, could not resist. No comment, never seen it, never played it. You could try search google for it. Mobefire has guides, and I'm sure someone has made a yorick jungle guide

I tried doing Yorick jungle a little while ago. It can sustain fairly well by juggling the Q-E ghouls to draw off camp harass, though the ganks are fairly lackluster unless they're pushed up.

Upside, you can get Cinderhulk.

On a side note, Yorick support is pretty darn amazing.

The big question: Is Yorick still viable? The big answer: no

I see two main build paths for my personal jungle Yorick that do very well in my opinion.

1. Cinderhulk, Black Cleaver, tear item and tank.
2. Warrior, Sheen item (TF if snowballing, IG if not so much), tear item, and tank.

Both provide all around decent stats. The second build is great if you've snowballed and will make your damage immense. The first allows you to do more of the tanking for the team. Both builds provide decent tank stats and help you maintain a decent amount of damage even in the later stages of the game.

IMO, jungle Yorick is significantly stronger than top lane, but is only useful if your team has another form of hard CC. With blue buff, he's able to sustain forever and win nearly all early jungle duels. I love it.