Hi Sunil,
Do you mean just a moving background that plays all the time? Or something which needs to be started at some point and then play in loop?
The first option is the easiest to answer. In your XPression-project you need to add the video to the position you need, and in the material settings, you need to set the video to Loop and check the Auto Start.

If you need the second option where you need to start some newsfootage on a screen behind a presenter at some point, I'm sure there is a way to do it as well.
I haven't used Trackless Studio myself, but I know you can trigger Scene Directors, so that would already be one option but there might be easier solutions too.
Best regards,
Ken
#XPression