To permanently delete photos,videos on iPhone, you can use a iPhone Data Eraser.Here,I recommend you this iPhone Photos Eraser.
The iPhone Data Eraser software provides the most effective and safest data protection solution available by permanently wiping all personal data from the device and resetting system setting with just one click. Afterwards, there’ll be no other data recovery tools that can recover any personal data from the device; not even iPhone Data Recovery software. So you can "Clean Slate" privacy safeguard for ultimate privacy protection with 1-Click and prevent identity theft.
Three steps to permanently wipe iPhone data
Step 1. Connect your iPhone to computer
Step 2. Choose the right option on your device
Step 3. Permanently Erase all photos on your iPhone
If one does not want to share his/her secret with others, he/she will hide it. Here, we provide a new mode for you do this: delete the documents first and then use iOS Data Recovery to restore them. Amazing, isn't it? Or, you may simply use it as a tool to get rid of the things you don't need any more, such as Cookies and messages. Deleting them in batches is much better than doing it on the iPhone.
Read more: How to erase all contacts on iPhone permanently
Erase iPhone Data: http://how-delete-iphone-data.blogspot.com