When a video starts playing, the controls disappear so they don’t obscure the video.
Tap the screen.

Tap
or
. You can also press the center button on the iPhone headset (or the equivalent button on your Bluetooth headset).
Drag the volume slider, or use the volume buttons on the side of iPhone. You can also use the volume buttons on the iPhone headset (iPhone 3GS only).
Tap
.
Tap
twice to skip to the previous video. Tap
to skip to the next video.
Touch and hold
or
.
Drag the playhead along the scrubber bar.
Tap Done, or press the Home
button.
Double-tap the video. You can also tap
to make the video fill the screen, or tap
to make it fit the screen.
Start playing a video and tap
.
Start playing a video and tap
.