Capitalize First Letter after (

[ohrenkino]

As everything is already explained in this post:

Capitalize First Letter after (

Create a new action of the type "Case Conversion". Enter the field (probably TITLE) Enter all the letters after which you wish to get a capitalized letter, e.g. the blank, the bracket, a comma, a full stop, a hyphen, a semicolon etc. Select as type "Normal". Save it, apply it.

I wonder where you got stuck.
But see the FAQs first, esp.
Actions and batch-operations - #2 by dano