How do I import a view? Recently, I migrated Drupal 7 to Drupal 8 using the Migrate upgrade module, but the views aren't migrated. 

Is there any method to import views from Drupal 7 to Drupal 8?
Unfortunately there is no upgrade path for views from D6/D7 to D8 and plans for this in core are postponed.

See the latest comment for this issue https://www.drupal.org/node/2500547#comment-11402389. There is a contrib project mentioned, but this is at very early stage.