How can I make Capital letter ( upper-case ) permalinks?

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The page URLs are defined by the slugs, and by default they are formatted and lower-cased by the function sanitize_title_with_dashes(). However, this function is called via a filter, and you can unhook the filter so it doesn’t get called:

remove_filter( 'sanitize_title', 'sanitize_title_with_dashes' );

Just doing this is probably not a good idea, as it will not remove the spaces and other weird stuff in the slug. I suggest you copy the existing function, remove the part that lowercases it, and hook it up again:

add_filter( 'sanitize_title', 'wpse5029_sanitize_title_with_dashes' );
function wpse5029_sanitize_title_with_dashes($title) {
    $title = strip_tags($title);
    // Preserve escaped octets.
    $title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title);
    // Remove percent signs that are not part of an octet.
    $title = str_replace('%', '', $title);
    // Restore octets.
    $title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title);

    $title = remove_accents($title);
    if (seems_utf8($title)) {
        //if (function_exists('mb_strtolower')) {
        //    $title = mb_strtolower($title, 'UTF-8');
        //}
        $title = utf8_uri_encode($title, 200);
    }

    //$title = strtolower($title);
    $title = preg_replace('/&.+?;/', '', $title); // kill entities
    $title = str_replace('.', '-', $title);
    // Keep upper-case chars too!
    $title = preg_replace('/[^%a-zA-Z0-9 _-]/', '', $title);
    $title = preg_replace('/\s+/', '-', $title);
    $title = preg_replace('|-+|', '-', $title);
    $title = trim($title, '-');

    return $title;
}

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