You can integrate with Maximo through PI AF.
Set up a connection to Maximo's Oracle database, and set up an AF Table using the SQL query of your choice. Then create table lookup attributes to collect the data into your AF model, and use that AF model as the data source for your PI Vision display.
There is no way to directly link PI Vision to Maximo. As Asle suggested, you could create linked tables in AF to retrieve the data. Or, you could also use the PI Interface for RDBMS to write the data to PI Points in the PI Data Archive.
Hope this helps,
I'm looking into something similar but need to move info both directions. AF to Oracle table option will work but is prone to issues if IBM decide to change underlying schema one day. However you might want to look into Maximo JSON RESTful API. You can link via the URI data ref in API by putting the relevant URL.