Find history of rollbacks on SQL Server 2012
Do you mean ROLLBACK TRANSACTION? Not very easily. You could use DBCC LOG or fn_dblog() to find rollbacks that have happened in the active transaction log. Getting the same information from old log backups requires fn_dump_dblog().

SELECT
    l.name,
    r.*
FROM fn_dblog(NULL, NULL) r
    LEFT OUTER JOIN fn_dblog(NULL, NULL) b
        ON r.[Transaction ID] = b.[Transaction ID]
        AND b.Operation = 'LOP_BEGIN_XACT'
    LEFT OUTER JOIN master.sys.server_principals l
        ON b.[Transaction SID] = l.sid
WHERE r.Operation = 'LOP_ABORT_XACT'


A better option would be to configure either a trace or extended event session to record rollbacks, though this would only help you going forward.