You can do this pretty easy, but not using the Dolphin video module.
To create a video showcase do the following
Create a folder in your webroot - call it showcase (or whatever)
Download jwplayer from http://www.longtailvideo.com
Upload to showcase folder
On the page you want the video to display, create a custom html block with following code
CODE REMOVED AS IT IS BEINGS STRIPPED OUT - SEE POST BELOW
Where yourvid.flv is your video
So now you should have a file showing in the video player in a block on your page.
I have not tested this, so please check things like file paths, and video format settings are correct. More info on setting up JWPlayer including a quick wizard can be found at http://www.longtailvideo.com/support/jw-player/jw-player-for-flash-v5/12/install-the-jw-player-for-flash-v5
The only caveat is that you may have to convert your video before uploading it, but from memory JWPlayer plays most formats.
The next thing to do is to add a plugin to the player - the one you want is the Drelated plugin - http://www.longtailvideo.com/addons/plugins/54/D-Related
This plugin allows you to show thumbnails of selected clips in the video player window - just like the utube video above. You will need to do two things to get this to work.
1 / install the plugin (instructions via link above)
2 / either manually create an XML clip list to use with the plugin - as per instructions
or...
2 / write a bit of php code that reads in any the videos to the directory and automatically creates the xml list
Job done!!
Personally I would use the second option, and also expand on this idea a little and add in a post variable so that you can also use it to return the latest title.
EG
http://yoursite.com/showcase/yourvid.flv
Would become something like
http://yoursite.com/showcase/myscript.php?myvar=getlatest
and the drelated plugin would use
http://yoursite.com/showcase/myscript.php?myvar=getxml
Then all you have to do is simply upload your videos by ftp and it automatically does the rest
HTH
/DM