thread pool for what?
Please find this JBoss EAP: 19.2. Connector Configuration
HTTP thread pool in WildFly.
If workers are using, I would like to know how to configure it to support large set of concurrent users. Also, checking for how to get the run time statistics of it.
There is threads sub system in wildfly-8.2 but how it can be linked to http connector to use thread pool?
You can configure thread pools for the undertow subsystem  by referencing a worker that is defined in the io subsystem.