I suggest you to add a new metafield for all the Images in the Libraries. You will still use the Image type libraries for your web cams. You can upload a thumbnail representing each camera, and store the URL of the camera image in the metafield. Then, you should only create a user control which is taking the metafield's value (using the GetMetaData() ).
Another way that comes to my mind, is to create a new type of library, having only the metafields you need, for example URL field and Name field.
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the Telerik team