Hi @tvpraha7
Sorry to hear you are having this issue.
We tested Divi & Extra theme on our end but we were unable to replicate the problem.
From your description it sounds like the Lazy Load is causing the issue, so we tested:
Divi theme > Video
Extra Theme > Video using Divi Editor
Extra Theme > Video using Gutenberg Editor
Added an animation to the video same as Smush Lazy Load.
Do you have any other Lazy Load plugins? If so, it would conflict with Smush > Lazy Load so it is important to disable that Lazy Load first.
You can also test the Native Lazy Load and see if this makes any difference: https://wpmudev.com/docs/wpmu-dev-plugins/smush/#lazy-loading
In case you don’t have any other plugin and native lazy load didn’t help, kindly create a ticket https://www.ads-software.com/support/plugin/wp-smushit/#new-topic-0 and we will be happy to help you with the troubleshooting and hope to convert it into a 5 stars experience.
Best Regards
Patrick Freitas