add simple video example

examples/videos.json5

@@ -0,0 +1,12 @@
+{
+  outPath: './videos.mp4',
+  defaults: {
+    transition: {
+      name: 'linearblur',
+    },
+  },
+  clips: [
+    { layers: [{ type: 'video', path: './assets/IMG_4605.MOV', cutFrom: 0, cutTo: 2 }] },
+    { layers: [{ type: 'video', path: './assets/IMG_1884.MOV', cutFrom: 0, cutTo: 2 }] },
+  ],
+}