How do i delete pictures and videos of the sony handad dcr-dvd201 dvd camcorder?

You can recover deleted video and pictures from Sony Handycam with file recovery software, recommended asoftech data recovery as it helped me before. download from link below
Camcorder Picture and Video Recovery Software

You may refer to this tutorial also

Deleting files from camcorder is just like clearing the recycle bin or Trash onyour comptuter. The data itself isn't deleted, just the area containing the deleted data is also now marked as free space so it is available for any new data to be written there instead. So a simple delete won't make your pictures and videos erased permanently.

As a result, you have chance to retrieve those deleted pictures & videos as long as the video data on your camcorder(memory card or hard disk) are not written over. And the best way is to try some photo recovery software, here are some for your options. Both programs can also recover videos and music.

video photo recovery program (for Windows OS)
Mac video photo recovery program (for Mac OS X)

First of all you need to install the program on your computer (choose the right version based on the operation system you are running), then connect your camcorder (memory card or HDD) to the computer and start to recover your deleted files.

One More Tip: Your should act as soon as possible and before the deleted pics and videos are recovered, better not take more videos in case overwritten situation will happen.

I hope you good luck, Merry Christmas!