Whilst there is no integrated capability to perform physical to virtual migrations in RHV itself, Red Hat provide p2v tools to customers to export existing physical machines to a virtual infrastructure whilst ensuring that relevant changes are made to the new guest, e.g. Paravirtualization drivers.
Red Hat also partners with 3rd partys e.g. Acronis to perform v2v and p2v migrations. RHV provides the virt-v2v tool, enabling you to convert and import virtual machines created on other systems such as Xen, KVM and VMware ESX. virt-v2v is available on Red Hat Network (RHN) in the Red Hat Enterprise Virt V2V Tool, details here: http://red.ht/zFpc6i