How to upload videos into custom object record like as photo upload in rich text field. no need to display a link i want to display a video
Salesforce doesn't really shine as a streaming video provider ;) so the best route for an admin is to integrate with a third party service like Youtube. They handle encoding, hosting, and the video player:
Then you can edit the Page Layout for your Custom Object and place your Visualforce Page in a section alongside the other fields.
It will be taxing to get this functionality embedded in a rich text field. If you did store the videos on platform, you could write a shortcode parser and use JWPlayer to attempt to tighten the integration.