If you're using the Clipchamp Utilities converter, compressor and recorder, yes, recovering past video files is possible in some circumstances if the clip is still available in your browser. Please see this support article about the recover section in the dashboard to find out more.
If you're using the Clipchamp Create video editor, and have deleted or lost the original files you used in your Create project from your computer, unfortunately recovering the files is not possible through Create (see Why do I need to relink my files? for an explanation). We suggest retrieving the files from their original source – e.g. many smart phones keep backups of deleted videos for a certain number of days.