You can place elements of Visual Composer on top of one another (including text over image) by applying negative margin value in the element Design Options.To overlap elements:Add any two elements on the page (ex. image and text)Open the edit window of the second elementIn the Design Options add negative top margin valueNote: You can use responsive Design Options settings to control the overlap across different devices.
How to place a text to overlap with an image?
How to place a text to overlap with an image?