First of all, you should stop using Canon camera. Do not use the Canon camera take any photos, do not shoot any videos with Canon camera.
You can then try this tutorial: Canon camera video recovery guide
Download Canon camera data recovery software from the link above and use it to recover deleted photos and videos from your canon camera, such as Canon EOS 5D Mark IV, Canon EOS 5DS, Canon EOS 7D Mark II, Canon EOS Rebel T6i / Canon EOS 750D, Canon PowerShot D30, IXUS 145, 150, 265, IXUS 170, 165, 160, Canon PowerShot N and N100, Powershot SX600 HD, SX700 HS, SX170 IS, SX400 IS, SX510 HS, SX529 HS, SX60 HS, etc.
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