showPlaybackControls property
Play/pause only, and off by default. There is deliberately no progress bar in full screen — a scrubber pinned to the bottom edge fights the CTA that lives there — and the play/pause button goes the same way: the top corners are for leaving (×) and for sound (mute), the bottom is the CTA's, and a third control competes with both.
The trade-off is real and deliberate: with this off there is no way to
pause a full-screen video, since tapping the media does not toggle
playback (it does nothing while expanded). Mute is the escape hatch. Flip
this to true for long-form creative where pausing matters.
Implementation
final bool showPlaybackControls;