If you are using the simple template for your webinars (the default template), then there are four locations to choose from for calls to action

Our recommendation is to use the Top Side Right Option.
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​Top Side Right: Call to action will appear to the top side right of the video on desktop and for mobile above the video for portrait, but on the video for landscape mode
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Here is how it looks like on portrait mode for mobile:
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Here is how it looks like on landscape mode for mobile for the Top Side Right

Here is how the other options work.
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​Beneath Video: Call to action, in this case, will appear under the video for desktop and mobile portrait view but on video for landscape
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​On Video: Call to action will appear bottom side right on the video for both desktop and mobile.

Bottom Side Right: Call to action will appear on the bottom side right of the video on desktop and for portrait mode on mobile, but on the video for landscape mode