Hi!
I read from forum but I did not understand exactly is the Homematic IP HUB and devises works with HA or not ?
I have actual Homematic IP Home Control Access Point (not based on raspberry or something like that ) and over that plenty of Radiator Thermostats, plug connectors, Thermostats and windows/door switches.
Can I get thous work over HA and integrate to my system ?
Every hit is welcome 
If its possible - how to I get the HomematicIP device IP address, username and password etc.?
The Homematic IP access point is not supported. The existing Homematic implementation uses the XML-RPC API that the CCU and Homegear expose. The IP access point has no such API.
There is however some effort in reverse engineering and a related project linked in this issue: https://github.com/danielperna84/pyhomematic/issues/88
To make use of that API a new component in Home Assistant would be needed since the IP access point works very different compared to the XML-RPC API based products.