@lavanyadeepak-0 Some browsers for Linux lacks the proper video codecs. The solution is to download the library that provide those: libffmpeg.so
Download it and replace the one that comes with the Opera installation. A word, everytime a mayor update is installed, chances are that the libffmpeg.so library is going to be replace with one that could not provide the proper codecs. So keep it handy the latest version and the howto info (I am providing this info like this,in order that a less experienced user could fix this issue)

Codec: https://github.com/nwjs-ffmpeg-prebuilt/nwjs-ffmpeg-prebuilt/releases
Get the 0.78.1-linux-x64.zip

Extract it and with admin rights, copy it in (if using File browser, get admin permission by File - Open as Administrator. A new window will open). Copy it from download location and paste and replace the one in the following folder:
/usr/lib/x86_64-linux-gnu/opera/libffmpeg.so
/usr/lib/x86_64-linux-gnu/opera/lib_extra folder/libffmpeg.so (just in case)

@lavanyadeepak-0

Make sure the chromiun libffmpeg version matches your Opera Installation.
I've uninstalled Opera using the Software Manager and installed this version:

Then I replaced the libffmpeg with the one from the 0.78.1-linux-x64.zip in this folder: /usr/lib/x86_64-linux-gnu/opera/libffmpeg.so

@mochica

@lavanyadeepak-0

Make sure the chromiun libffmpeg version matches your Opera Installation.
I've uninstalled Opera using the Software Manager and installed this version:

Then I replaced the libffmpeg with the one from the 0.78.1-linux-x64.zip in this folder: /usr/lib/x86_64-linux-gnu/opera/libffmpeg.so

@lavanyadeepak-0 Some browsers for Linux lacks the proper video codecs. The solution is to download the library that provide those: libffmpeg.so
Download it and replace the one that comes with the Opera installation. A word, everytime a mayor update is installed, chances are that the libffmpeg.so library is going to be replace with one that could not provide the proper codecs. So keep it handy the latest version and the howto info (I am providing this info like this,in order that a less experienced user could fix this issue)

Codec: https://github.com/nwjs-ffmpeg-prebuilt/nwjs-ffmpeg-prebuilt/releases
Get the 0.78.1-linux-x64.zip

Extract it and with admin rights, copy it in (if using File browser, get admin permission by File - Open as Administrator. A new window will open). Copy it from download location and paste and replace the one in the following folder:
/usr/lib/x86_64-linux-gnu/opera/libffmpeg.so
/usr/lib/x86_64-linux-gnu/opera/lib_extra folder/libffmpeg.so (just in case)