Lets quote the release notes:
Limitations
The following limitations affect this release of Cisco Jabber Video for TelePresence.
Description Workaround/solution
Due to application-specific support for Windows APIs, not all applications can be shared with Jabber Video at this time. Platforms known to cause presentation sharing issues in Jabber Video include Adobe AIR and GTK+.
Sharing the entire screen rather than the application window works for most applications.
In addition Jabber Video is not optimized to share video in the presentation channel.
If you want to do this I would recommend a dedicated endpoint.