How to refresh the interface across threads in VTK

Question

I want to use VTK to implement such a function: 1.An independent thread loops to read a video 2.After reading a frame of video data, the main interface displays, and the thread will not block the main interface How can I do that? May I use callback func to do that? English is not my native language, please forgive.

I tried using vtkcommand to add listening events. When the data in vtkImageImport changes, I called a callback function to update vtkImageViewer2, but it failed