# Subscribe to the preview video

**URL:** <https://devforum.zoom.us/t/subscribe-to-the-preview-video/48139>\
**Category:** iOS\
**Created:** [April 16, 2021, 12:35pm UTC](https://devforum.zoom.us/t/subscribe-to-the-preview-video/48139 "2021-04-16T12:35:17Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![blindgaenger](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/blindgaenger/32/25789_2.png) [@blindgaenger](https://devforum.zoom.us/u/blindgaenger)\
**Post date:** [April 16, 2021, 12:35pm UTC](https://devforum.zoom.us/t/subscribe-to-the-preview-video/48139/1 "2021-04-16T12:35:18Z")

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Hi there,

I want to show a preview video before joining the session. The description in the `ZoomInstantSDKVideoCanvas.h` header file states the following:

> Call the function to subscribe video or share data. You can subscribe your ‘preview video’ data with userid=0 before entering the session, you can just call it after you called “joinSession:”. Otherwise, you can subscribe video or share data using the real userid in callback “onUserJoin:”.

I’m not sure if I understand the description right. I assumed `userid=0` means the user instance of `mySelf`. But I can’t get an instance if I’m not in a session.

Is there a way to show a preview of the local video?

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**Author:** ![jon.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/jon.zoom/32/13495_2.png) [@jon.zoom](https://devforum.zoom.us/u/jon.zoom)\
**Post date:** [April 16, 2021, 5:35pm UTC](https://devforum.zoom.us/t/subscribe-to-the-preview-video/48139/2 "2021-04-16T17:35:38Z")

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Hi @blindgaenger, thanks for the post.

There is no way to render video of any user through the SDK outside of a session. If you wish to display a user’s video outside of a session, it would need to be done without using the SDK.

Thanks!

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**Author:** ![blindgaenger](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/blindgaenger/32/25789_2.png) [@blindgaenger](https://devforum.zoom.us/u/blindgaenger)\
**Post date:** [April 17, 2021, 7:31am UTC](https://devforum.zoom.us/t/subscribe-to-the-preview-video/48139/3 "2021-04-17T07:31:24Z")

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That’s unfortunate, but understandable. Thanks @jon.zoom for your quick reply.

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**Author:** ![Michael\_Condon](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/michael_condon/32/13543_2.png) [@Michael\_Condon](https://devforum.zoom.us/u/Michael_Condon)\
**Post date:** [April 19, 2021, 10:05pm UTC](https://devforum.zoom.us/t/subscribe-to-the-preview-video/48139/4 "2021-04-19T22:05:38Z")

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Hey @blindgaenger,

Please let us know if you have any other questions.

Thanks!

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**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\
**Post date:** [May 20, 2021, 8:05am UTC](https://devforum.zoom.us/t/subscribe-to-the-preview-video/48139/5 "2021-05-20T08:05:50Z")

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Closed on May 20, 2021, 8:05am UTC

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