You can reference the client-side object of RadCaptcha via the $find
captcha = $find(
then use the get_textBox()
methods of this object to retrieve the elements of the textbox and the textbox label:
captchaTextBox = captcha.get_textBox();
captchaTextBoxLabel = captcha.textBoxLabel();
After this is done you can use these elements to manipulate their styles and postilion in the DOM as required in your scenario.
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.