[native] Make types ReadOnly in lib/media/video-utils
[native] Make types ReadOnly in lib/media/video-utils

Summary: NA

Test Plan: Flow

Reviewers: ashoat, palys-swm

Reviewed By: ashoat

Subscribers: KatPo, zrebcu411, Adrian, subnub

Differential Revision: https://phabricator.ashoat.com/D922

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