And double click one of the results, and you can see the video with a big view (please see below picture and the red square, is this what you want to do?)
currently MIP toolbar plugins are not really enabled in the Centralized Search workspace (tough, you can force them to activate; see details below)
when forced to activate, plugin will have limited access to the calling context
Now in details.
The Centralized Search workspace does not have toolbar and thus any toolbar plugins support. That is why you do not see CentralizedSearch workspace ID in the ClientControl-class. At same time, if you specify that your plugin can activate in any workspace, you will see it appeared in the Playback control toolbar. You do it by specifying empty workspaces ids list in the plugin definition:
ViewItemToolbarPlaceDefinition.WorkSpaceIds = new List<Guid>() { };
But, when activated inside of the Centralized Search workspace playback control, your plugin will receive null as hosting window:
public override void Init(Item viewItemInstance, Item window)
{
_viewItemInstance = viewItemInstance;
_window = window; // currently is null in the Centralized Search workspace
In other words, activating toolbar plugin inside of the Centralized Search workspace is a challenge.
We noted that as a missing functionality and added a story for it in our backlog.