Hello @hopialikeit. Thank you for referring your issue with your Flash 2.
Let me verify the following and have your camera settings checked.
1. Have you try differ the focus via touching the screen for a better view? check in camera setting, regarding the front camera video recording, it's not that prefect comparing with the rear FHD1080P, front cam is HD720P.
2. It's generated by generic Android, can fix via 3rd party APP & the Marshmallow segik!!
Please let us know if the issue still persists. Have a nice day!