Any body can help me ho to fix video issue look like camera always focusing pls help

It cannot focus. The spark has a fixed camera.You could be in exposure touch mode.
Tap the small circle on bottom left corner.

I mean the video is not clear it blurry and clear back and forth try to upload video

Please tell me your version of firmware?  Any error showed in the app? Please provide a screenshot of your camera setting and the original videos.  

Do you have an example online?

Try to reset the camera settings, If it persists, please upload an original video from the SD card to the Dropbox for better assistance.