If you want to use Sentry 2 filters used in Laravel 4.x, you have to modify your system a little bit.
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First install Sentry 2 for Laravel 5: "composer require cartalyst/sentry:dev-feature/laravel-5"
Next add these three files to your App\Http\Middleware folder, then add the references into the Kernel.php file.
Finally, I added an example route how to use the Middlewares.
An advice: in your controller replace all catch() lines
from:
catch (Cartalyst\Sentry\Users\LoginRequiredException $e) {}
to:
catch (\Cartalyst\Sentry\Users\LoginRequiredException $e) {}
because it won't work as in Laravel 4.x worked..