Dear Sir,
Since SCCM 2012 SP1 released, it come to support for Microsoft Azure Virtual Machines. However, it's not supported exactly as widely as support on-premises VMs. You can review below blog for two scenarios:
https://blogs.technet.microsoft.com/configmgrteam/2013/10/23/system-center-2012-configuration-manager-and-system-center-2012-endpoint-protection-support-for-windows-azure-virtual-machines/
There are fellows who has tried SCCM on Azure, however, not using migration, but fresh install. Below is an example to get an overview on how these get done:
http://mylifeasasysadmin.blogspot.sg/2015/04/sccm-2012-r2-lab-on-azure.html
Best regards
Frank
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