I guess I'm going to try to answer my own question after hours of trial and error. The steps I took doesn't make any sense at all but somehow it works so I'm not going to spend time trying to figure out why. I have replicated these steps in 2 different servers and they both works after these steps..
Installing Couchbase Server
First remove php-devel (don't know why but it seems to work this way). Here is the reference:
yum remove php-devel
yum install -y openssl098e
rpm -ivh http://packages.couchbase.com/releases/2.0.1/couchbase-server-community_x86_64_2.0.1.rpm
go to your couchbase web browser at: "
http://yourhost:8091" and configure it.
Now installing the Php-extension
yum install -y php-devel
wget -O /etc/yum.repos.d/couchbase.repo http://packages.couchbase.com/rpm/couchbase-centos62-x86_64.repo
yum install -y libcouchbase2 libcouchbase-devel libcouchbase2-libevent
pecl install couchbase
echo "extension=couchbase.so" >> /etc/php.d/json.ini
That's it. Voila......... It works. So I thought I share this with whoever can make use of it... Good luck..