feat(Header): fix video size (#625)

Author: Lakate

src/blocks/Header/Header.scss

@@ -116,7 +116,8 @@ $backgroundWidth: 1440px;
         > video {
             border-radius: $borderRadius;
             width: 100%;
-            height: auto;
+            height: 100%;
+            object-fit: cover;
         }
     }