while coverting(p2v) using Vcenter converter standard alone at the time of destination selection , if i dont have the username and password of the destination host is there any other way to select destination or any other destinations for p2v conversion
Welcome to the Community - No you need access to the destination host - the credentials used will need the approriate level access to create the VM
You cannot convert to an vCenter or an ESXi unless you have appropriate credentials, but you could select "VMware Workstation ..:" as the destination and convert the system to e.g. a file share. However, in this case you'd need to convert the resulting VMware Workstation VM a second time, if you want to run it in vCenterServer/ESXi.