a1tus

class Inline(admin.TabularInline):
    model = B.items.through


class A_Admin(admin.ModelAdmin):
    inlines = (Inline,)


class B_Admin(admin.ModelAdmin):
    exclude = ('items',)

a1tus

class VideoRelGenericInline(generic.GenericTabularInline):
    model = VideoRel
    raw_id_fields = ('video',)
 
 
class AnotherModelAdmin(admin.ModelAdmin):
    inlines = (VideoRelGenericInline,)
 
 
admin.site.register(AnotherModel, AnotherModelAdmin)