I assume you're asking about public Rights of Way that cross private land. In general yes, you can film/photograph the surrounding private area, but there are a few things to be aware of. First that standing still or erecting a tripod can be considered obstruction, for which you can be arrested by police, so try to avoid that. Second that National Trust, has sought to prevent commercial photography of any of their land, flora and fauna, or properties, from public Rights of Way (see Copyright Action articles on National Trust for details). Third that considerations of privacy may apply. You cannot, for instance, photograph through a window into a house interior to obtain a photo of someone.