It depends on exactly what you mean.
Many themes have custom image header and custom background features.
A few themes do provide for changing font color in the Blog Title and/or optional Tagline and/or links. In the majority of themes font changes to font families, colors and size in the blog title, tagline, menu, post titles, page titles, categories and tags, widget headings, comments, and links cannot be done without CSS editing.
If you have CSS editing skills and purchase an annually renewable custom design upgrade your can change fonts and other appearance elements on any theme, but you cannot change how any theme functions.
WordPress.com supports videos from the sources > http://en.support.wordpress.com/videos/
If you want to upload your own videos then you can wither upload them to youtube or another supported site and embed them free of charge, or your can purchase an annually renewable videopress upgrade.
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