I want to interface camera to MCB2300 through USB interface. Please let me know how this should be done.
"In this sample the Host init function don't work"
That tells us virtually nothing!
It's like saying, "My car doesn't work - what's wrong with it?"
You need to describe precisely what you expected it to do, precisely what it actually did and - most importantly - what you have done in your attempts to account for the difference!
"I have used uart debug string"
What UART debug string?
How did you use it?
What did you find out from using it?
"also the uVision4 debug mode"
Again, how, exactly, did you use it?
Did you use JTAG to access the actual hardware?