Edouard has given you the details. If you're using WC3, you also have two additional videos you can use: MOVIES$ and DAILY_MOVIE$. The first replaces the old tags that put the hourly vid onto your web space. The latter is a time-lapse with the whole day.
Here's the whole html for getting the vid(s) up to your web space:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Testing Web Camera Uploading</title>
</head>
<body>
<!-- Uploads the hourly mp4 file called "WeatherCat1hrMovie.mp4" -->
MOVIE$
<!-- Uploads the a time-lapse mp4 file called "WeatherCatDailyMovie.mp4" -->
DAILY_MOVIE$
</body>
</html>
Actually, you don't really need the <head></head> stuff or the comments, of course... Put this file in the "Additional Files" list and set a time like 60 minutes to upload the video(s) once an hour. I use 20 minutes so I don't have to wait more than that if the actual upload occurred just after this additional file last uploaded. We can't, yet, set a particular time for these files to upload. As far as I know, the 'timer' starts when the change to the prefs are saved.
To actually display the video on your site, your page needs the following html:
<video class="mp4-size" autoplay controls>
<source src="http://www.mid-southweather.com/WeatherCat1hrMovie.mp4" type="video/mp4">
Your older browser does not support the video tag.
</video>
If your viewers are using a non-html5 browser, they'll see that last bit of text and might encourage them to update their XP browser!
Hope that helps.