Hi sasmita swain,
I did same in my portal 6.1 CE,
1<portlet>
2 <portlet-name>videoadmin</portlet-name>
3 <icon>/icon.png</icon>
4 <control-panel-entry-category>my</control-panel-entry-category>
5 <layout-cacheable>true</layout-cacheable>
6 <add-default-resource>true</add-default-resource>
7 </portlet>
The above code i added in liferay-portlet.xml, The portlet is displaying only for admin.
But if you want display to particular user,
I followed the below steps:
1) First I created role.
2) In Role Define permission--> I given that particular portlet permissions.
3) Then I assigned that role to particular user.
particular User also can view that portlet.
I think the above information helpful to you.
Thanks...