create-video-context.md

## uni.createVideoContext(videoId, component?) @createvideocontext

<!-- UTSAPIJSON.createVideoContext.description -->

<!-- UTSAPIJSON.createVideoContext.param -->

<!-- UTSAPIJSON.createVideoContext.returnValue -->

<!-- UTSAPIJSON.createVideoContext.example -->

<!-- UTSAPIJSON.createVideoContext.compatibility -->

<!-- UTSAPIJSON.createVideoContext.tutorial -->

<!-- UTSAPIJSON.general_type.name -->

<!-- UTSAPIJSON.general_type.param -->