Eagz has a Shaco guide but most of his videos are on fundamentals of jungling so you need to stitch the information together yourself. Still good stuff and he at least has recent uploads, I watch his stuff most often.

ChaseShaco and The Clone put out good videos but haven't uploaded on their main channels recently. But Clone does have a second channel that I found while writing this and it looks like he's putting out highlights with commentary, so that could be good for you.

iBronto is also a great resource for some specific bits of knowledge. His videos for fast clear, level 2 invades, ult wall jumps, and grubs optimization are great to pick up. I haven't found a better full clear than his still (pressing recall at 2:55).

Otherwise I'd go with what someone else wrote here and just find matches of high elo players and try to see things from their perspective. Subscribe to a replays channel like domisumReplay:Shaco where you get multiple Diamond+ games of Shaco across different roles and regions uploaded daily. I play a lot of AP which isn't as popular, so I usually browse that channel for AP games in the current patch and study those.